Best Open Source Windows HTML/XHTML Software 2026

HTML/XHTML Software for Windows

HTML/XHTML Windows Clear Filters

Browse free open source HTML/XHTML software and projects for Windows below. Use the toggles on the left to filter open source HTML/XHTML software by OS, license, language, programming language, and project status.

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1

Dompdf

HTML to PDF converter for PHP

dompdf is an HTML to PDF converter. At its heart, dompdf is (mostly) a CSS 2.1 compliant HTML layout and rendering engine written in PHP. It is a style-driven renderer, it will download and read external stylesheets, inline style tags, and the style attributes of individual HTML elements. It also supports most presentational HTML attributes. PDF rendering is currently provided either by PDFLib or by a bundled version the R&OS CPDF class written by Wayne Munro. (Some important changes have been made to the R&OS class, however). In order to use PDFLib with dompdf, the PDFLib PECL extension is required. Using PDFLib improves performance and reduces the memory requirements of dompdf somewhat, while the R&OS CPDF class, though slightly slower, eliminates any dependencies on external PDF libraries.

Downloads: 86 This Week

Last Update: 2026-03-03
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2

Tidy

The granddaddy of HTML tools, with support for modern standards

Tidy is a console application for macOS, Linux, Windows, UNIX, and more. It corrects and cleans up HTML and XML documents by fixing markup errors and upgrading legacy code to modern standards. libtidy is a C static and dynamic library that developers can integrate into their applications in order to bring all of Tidy’s power to your favorite tools. libtidy is used today in desktop applications, web servers, and more. Tidy tidies HTML and XML. It can tidy your documents by itself, and developers can easily integrate its features into even more powerful tools. Thanks for the efforts of HTACG and prominent contributors, HTML Tidy has a whole new heartbeat and a whole new life.

Downloads: 68 This Week

Last Update: 2024-01-11
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3

Twemoji

Simple library that provides standard Unicode emoji for all platforms

Twitter’s open source emoji has you covered for all your project's emoji needs. With support for the latest Unicode emoji specification, featuring 3,245 emojis, and all for free. As an open source project, attribution is critical from a legal, practical and motivational perspective in our opinion. The graphics are licensed under the CC-BY 4.0 which has a pretty good guide on best practices for attribution. Although there are two kinds of parsing supported by this utility, we recommend you use DOM parsing, explained below. Each type of parsing accepts a callback to generate an image source or an options object with parsing info. The second kind of parsing is string parsing. This is unrecommended because this method does not sanitize the string or otherwise prevent malicious code from being executed; such sanitization is out of scope.

Downloads: 47 This Week

Last Update: 2022-03-31
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4

OpenJade

An implementation of DSSSL, a style language to format SGML or XML documents. OpenJade contains backends for various formats (RTF, HTML, TeX, MIF, SGML2SGML, and FOT). This project also maintains OpenSP.

4 Reviews

Downloads: 228 This Week

Last Update: 2018-10-10
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geckodriver

WebDriver for Firefox

geckodriver is an implementation of WebDriver, and WebDriver can be used for widely different purposes. How you invoke geckodriver largely depends on your use case. If you are using geckodriver through Selenium, you must ensure that you have version 3.11 or greater. Because geckodriver implements the W3C WebDriver standard and not the same Selenium wire protocol older drivers are using, you may experience incompatibilities and migration problems when making the switch from FirefoxDriver to geckodriver. Generally speaking, Selenium 3 enabled geckodriver as the default WebDriver implementation for Firefox. With the release of Firefox 47, FirefoxDriver had to be discontinued for its lack of support for the new multi-processing architecture in Gecko. Since geckodriver is a separate HTTP server that is a complete remote end implementation of WebDriver, it is possible to avoid using the Selenium remote server if you have no requirements to distribute processes across a matrix of systems.

Downloads: 34 This Week

Last Update: 2026-06-03
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6

pdf2htmlEX

Convert PDF to HTML without losing text or format

pdf2htmlEX renders PDF files in HTML, utilizing modern Web technologies. It aims to provide an accurate rendering, while being optimized for Web display. Text, fonts and formats are natively preserved in HTML. Mathematical formulas, figures and images are also supported. pdf2htmlEX is also a publishing tool: almost 50 options make it flexible for many different use cases: PDF preview, book/magazine publishing, personal resume. pdf2htmlEX is optimized for modern web browsers such as Mozilla Firefox & Google Chrome. This is an era of Web. HTML, together with CSS and JavaScript, provides the flexibility allowing you to embed documents with beautiful themes, consistent bahivours and useful features. User experience will also be significantly improved, documents will be plugin-free and interactive, users can read while downloading.

Downloads: 33 This Week

Last Update: 2023-04-28
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7

Bootstrap

HTML, CSS and JS framework for developing responsive websites and apps

Bootstrap is an HTML, CSS, and JS framework designed for developing responsive, mobile first projects on the web. It's one of the most popular front-end frameworks and for good reason: it simply makes web development faster and easier. People of all skill levels can create projects of all sizes with Bootstrap, and for all types of devices too. With Bootstrap, you get a host of nifty features such as precompiled CSS, impressive scalability, dozens of custom HTML and CSS components and more.

Downloads: 31 This Week

Last Update: 2025-08-26
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8

tabler

Tabler is free and open-source HTML Dashboard UI Kit

Tabler is fully responsive and compatible with all modern browsers. Thanks to its modern, user-friendly design you can create a fully functional interface that users will love! Choose the layouts and components you need and customize them to make your design consistent and eye-catching. Every component has been created with attention to detail to make your interface beautiful! We've created this admin panel for everyone who wants to create templates based on our pre-made components. Our mission is to deliver a user-friendly, clear and easy administration panel that can be used by both simple websites and sophisticated systems. The only requirement is basic HTML and CSS (and some Liquid) knowledge, as a reward, you'll be able to manage and visualise different types of data in the easiest possible way! With the support for mobile, tablet and desktop displays, it doesn’t matter what device you’re using. Tabler is responsive in all major browsers.

Downloads: 24 This Week

Last Update: 2025-07-13
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9

XDXF - XML Dictionary Exchange Format

XDXF is a project to unite all existing open dictionaries and provide both users and developers with universal XML-based format, convertible from and to other popular formats like Mova, PtkDic, StarDict, ABBYY Lingvo etc. * New drafts of format can be found here: https://github.com/soshial/xdxf_makedict/tree/master/format_standard * The development of dictionary converter moved to Github: https://github.com/soshial/xdxf_makedict

17 Reviews

Downloads: 109 This Week

Last Update: 2013-05-23
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10

CyberNeko HTML Parser

NekoHTML is a simple HTML scanner and tag balancer that enables application programmers to parse HTML documents and access the information using standard XML interfaces.

17 Reviews

Downloads: 63 This Week

Last Update: 2015-04-17
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11

htmx

Hgh power tools for HTML

htmx gives you access to AJAX, CSS Transitions, WebSockets and Server-Sent Events directly in HTML, using attributes, so you can build modern user interfaces with the simplicity and power of hypertext. htmx is small (~14k min.gz’d), dependency-free, extendable & has reduced code base sizes by 67% when compared with react.

Downloads: 13 This Week

Last Update: 6 days ago
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12

Lexbor

Lexbor is development of an open source HTML Renderer library

Lexbor is the development of a web browser engine available as a software library; it ships with a free license and has no extra dependencies. For us, speed is an absolute must-have. In our development process, we focus on fastest parsing techniques for HTML, CSS, and fonts, fastest data processing methods, and fastest ways to serve content to end users. Whether you are building a backend that handles millions of HTML documents or a UI-heavy user app, your software’s response rate always matters to users and developers alike. Lexbor’s code is optimized for ease of access in end-user applications and across programming languages. You can effortlessly wrap all the capabilities of the library in, say, Python to power your end-user or backend applications in a new environment. In other words, lexbor offers a feature-rich core that developers can build upon as they see fit.

Downloads: 9 This Week

Last Update: 2026-03-31
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13

SingleFile

Web Extension for saving a copy of complete web page in a single file

Web Extension for Firefox/Chrome/MS Edge and CLI tool to save a faithful copy of an entire web page in a single HTML file. SingleFile is a Web Extension (and a CLI tool) compatible with Chrome, Firefox (Desktop and Mobile), Microsoft Edge, Vivaldi, Brave, Waterfox, Yandex Browser, and Opera. It helps you to save a complete web page into a single HTML file. Wait until the page is fully loaded. Click on the SingleFile button in the extension toolbar to save the page. You can click again on the button to cancel the action when processing a page. Open the context menu by right-clicking the SingleFile button in the extension toolbar or on the webpage. It allows you to save the current tab, the selected content, the selected frame. With auto-save active, pages are automatically saved every time after being loaded (or before being unloaded if not). Right-click on the SingleFile button and select "Manage extension" (Firefox) / "Options" (Chrome) to open the options page.

Downloads: 9 This Week

Last Update: 2024-03-28
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14

PufferPanel

PufferPanel is an open source game server management panel

The simplest, free, open source game management panel. PufferPanel is an open source game server management panel designed to be easy to use and easy to install. PufferPanel supports Minecraft, Forge, Spigot, Sponge, Source Dedicated Servers, BungeeCord, PocketMine, Forge, and much more. In addition to being a free and open source project, PufferPanel provides an easy-to-use interface for everyone from individual users to large networks or companies. We strive to create a friendly community, and we would love for you to join us.

Downloads: 7 This Week

Last Update: 2026-05-27
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15

miniblink49

Lighter, faster browser kernel of blink to integrate HTML UI in apps

miniblink is an open source, one file, small browser widget based on chromium. By using C interface, you can create a browser with just some line code. miniblink is an open source, single-file, and currently the smallest known chromium-based browser control. Through its exported pure C interface, a browser control can be created in a few lines of code. C++, C#, Delphi and other language calls (support C++, C#, Delphi language to call). Embedded Nodejs, support electron (with Nodejs, can run electron). Customize as you wish, simulate another browser environment. Perfect HTML5 support, friendly to various front-end libraries (support HTML5, and friendly to front framework). After turning off the cross-domain switch, you can use various cross-domain functions (support cross-domain). Headless mode, which greatly saves resources and is suitable for crawlers (headless mode, be suitable for Web Crawler).

Downloads: 6 This Week

Last Update: 2025-12-13
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16

HTML Anything

The agentic HTML editor

HTML Anything is an agentic HTML editor that helps local AI agents generate polished HTML artifacts across multiple content formats. It is built for workflows where the user describes a desired output and the agent writes the HTML that can then be previewed, edited, and shipped. The project supports a wide surface area, including magazine layouts, decks, posters, social posts, prototypes, and data-oriented artifacts. It emphasizes local-first creation, reusable design skills, and practical export paths rather than a closed hosted editor model. The repository uses modern web technologies and is positioned as a flexible creative workspace for agent-assisted design. Its value is in turning AI-generated HTML into usable visual deliverables without forcing every project into a traditional design tool.

Downloads: 5 This Week

Last Update: 2026-06-16
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17

YouTube Center

Userscript designed to expand the functionality of YouTube

YouTube Center is a userscript designed to expand the functionality of YouTube. It includes the ability to download the video you're watching, auto-selecting your preferred video quality and much more. YouTube Center is an extension for the browser that will enhance the experience on YouTube by adding tons of new and useful features. YouTube Center is a userscript designed to expand the functionality of YouTube. It includes the ability to download the video you're watching, auto selecting your preferred video quality and much more. We highly reccomend using DEV builds, as the stable build is nearly a year old, and much of its functionality is now broken. YouTube Center is available as the following extensions: Userscript, Firefox, Chrome, Opera, Safari and Maxthon. YouTube Center supports multiple languages. Your default language is automatically selected at default if it's available otherwise it will default to English.

Downloads: 5 This Week

Last Update: 2022-05-03
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18

HTMLViewer

HTML Viewer Components for Delphi, Lazarus and C++Builder The HtmlViewer component set consists of the THtmlViewer, TFrameViewer, and TFrameBrowser components. All three are HTML document display components: THtmlViewer * The basic component. * THtmlViewer displays single (non-frame) documents. * It also forms the basis for the other two components. TFrameViewer * Displays both frame and single HTML documents. * TFrameViewer is oriented more for local file system use. TFrameBrowser * Also displays frame and single HTML documents. * TFrameBrower is oriented for use with local file systems and toward Internet style protocols and URL usage. * Additional code and/or components are generally required to get data from other sources than the local file system. These components Support most of the HTML 4.01 specifications with many additional popular HTML 5 enhancements. Many Cascading Style Sheet properties are also supported.

3 Reviews

Downloads: 38 This Week

Last Update: 2023-03-12
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19

mht to htm

Conversion from *.mht files to *.htm files.

Conversion from *.mht files to *.htm files. mht2htm extracts all files from mht in single dir so you can open it on any OS. Also works with .eml, .msg, .nws... files

5 Reviews

Downloads: 41 This Week

Last Update: 2016-04-15
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20

7.css

A JS-independent, tree-shakeable CSS framework

7.css is a CSS framework for building interface components that look like Windows 7. It is built on top of the GUI backbone of XP.css, which is an extension of 98.css. This framework relies on the usage of semantic HTML. To make a button, you'll need to use a button. Input elements require labels. Tabs rely on the role="tab" attribute. This page will guide you through that process, but accessibility is a primary goal of this project. It does not ship with any JavaScript, so it is compatible with your frontend framework of choice.

Downloads: 4 This Week

Last Update: 2025-07-27
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21

CoreUI

Open Source UI Kit built on top of Bootstrap 5 and plain JavaScript

CoreUI Admin Panel is not another blend of 3rd parties free components and libraries. It's the only Open Source Bootstrap Admin Dashboard Template built on the enterprise-grade hand-crafted UI Components Library created and backed by professionals. CoreUI and CoreUI PRO are delivered with fully-featured, and ready-to-use admin panel templates for your application. Save thousands of development hours by using ready-made, reusable, and commonly used widgets and UI components. Moreover, CoreUI Bootstrap Admin Template is delivered with a ready-to-use environment, so you don't have to waste time configuring the project. All build scripts and tools are ready to use out of the box. With CoreUI Template you can start a new project in a minute!

Downloads: 4 This Week

Last Update: 2026-06-14
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22

DOMPurify

XSS sanitizer for HTML, MathML and SVG

A DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, SVG and MathML. It's also very simple to use and get started with. DOMPurify was started in February 2014 and, meanwhile, has reached version 2.3.0. DOMPurify is written in JavaScript and works in all modern browsers (Safari (10+), Opera (15+), Internet Explorer (10+), Edge, Firefox and Chrome - as well as almost anything else using Blink or WebKit). It doesn't break on MSIE6 or other legacy browsers. It either uses a fall-back or simply does nothing. Our automated tests cover 17 different browsers right now, more to come. We also cover Node.js v14.15.1, v15.4.0, running DOMPurify on jsdom. Older Node.js versions are known to work as well. DOMPurify is written by security people who have vast background in web attacks and XSS.

Downloads: 4 This Week

Last Update: 2026-06-17
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23

DinkToPdf

C# .NET Core wrapper for wkhtmltopdf library that uses Webkit engine

.NET Core P/Invoke wrapper for wkhtmltopdf library that uses Webkit engine to convert HTML pages to PDF. Copy the native library to root folder of your project. From there .NET Core loads the native library when the native method is called with P/Invoke. You can find the latest version of the native library. Select the appropriate library for your OS and platform (64 or 32-bit). The library was not tested with IIS. The library was tested in console applications and with Kestrel web server both for Web Applications and Web API.

Downloads: 4 This Week

Last Update: 2023-05-02
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24

Markdown Monster

An extensible Markdown Editor, Viewer and Weblog Publisher for Windows

Markdown Monster is a powerful, yet easy-to-use Markdown editor with syntax highlighting and sophisticated and fast edit features. A collapsible, synced, live preview lets you see your output as you type and scroll. Easily embed or paste images, links, tables and code using raw markup or our smart UI helpers to simplify many operations with a few keystrokes or a click or two. Paste images from the clipboard or drag and drop from Explorer or our built-in file browser. Inline spell-checking and word counts keep your content streamlined. You can export Markdown to PDF or HTML on disk or copy Markdown selections as HTML to the clipboard. The HTML preview can display syntax-colored code snippets for most coding languages. Choose from light or dark app themes, and individual and fully customizable preview themes. Use the built-in folder browser to open, manage and drag files into content, use the document outline to quickly jump through content, or use our shell integration.

Downloads: 4 This Week

Last Update: 2026-05-31
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25

Myrtille

A native HTML4 / HTML5 Remote Desktop Protocol and SSH client

Myrtille provides simple and fast access to remote desktops, applications, and SSH servers through a web browser, without any plugin, extension or configuration. Technically, Myrtille is an HTTP(S) to RDP and SSH gateway. User input (keyboard, mouse, touchscreen) is forwarded from a web browser to an HTTP(S) gateway, then up to an RDP (or SSH) client which maintains a session with an RDP (or SSH) server. The display resulting (or not) of such actions is streamed back to the browser, from the RDP (or SSH) client and through the gateway. The implementation is quite straightforward to maintain speed and stability. Some optimizations, such as input buffering and display quality tweaking help mitigate latency and bandwidth issues.

Downloads: 4 This Week

Last Update: 2023-04-26
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