A markup-based typesetting system that is powerful and easy to learn.

Universal markup converter

A rugged, minimal framework for composing JavaScript behavior in your markup.

A simple, Git-powered wiki with a local frontend and support for many kinds of markup and content.

Liquid markup language. Safe, customer facing template language for flexible web apps.

🪐 Markdown with superpowers: from ideas to papers, presentations, websites, books, and knowledge bases.

Hyperscript Tagged Markup: JSX alternative using standard tagged templates, with compiler support.

Forms made easy for Rails! It's tied to a simple DSL, with no opinion on markup.

A feature-rich dictionary lookup program, supporting multiple dictionary formats (StarDict/Babylon/Lingvo/Dictd) and online dictionaries, featuring perfect article rendering with the complete markup, illustrations and other content retained, and allowing you to type in words without any accents or correct case.

Open source rich text editor based on HTML5 and the progressive-enhancement approach. Uses a sophisticated security concept and aims to generate fully valid HTML5 markup by preventing unmaintainable tag soups and inline styles.

Determines which markup library to use to render a content file (e.g. README) on GitHub

:pencil: A markup-aware linter for prose built with speed and extensibility in mind.

A Rails form builder plugin with semantically rich and accessible markup.

Prompt Orchestration Markup Language

GEO-first SEO skill for Claude Code. Comprehensive AI search optimization for any website — citability scoring, AI crawler analysis, brand authority, schema markup, platform-specific optimization, and PDF reports. If you want learn how to sell this to real businesses, check out the skool community

:pencil: Markdown code for lots of small badges :ribbon: :pushpin: (shields.io, forthebadge.com etc) :sunglasses:. Contributions are welcome! Please add yours!

HEML is an open source markup language for building responsive email.

HTML Abstraction Markup Language - A Markup Haiku

Database Markup Language (DBML), designed to define and document database structures

Draw a leader line in your web page.

A simple markup language for creating rich terminal reports, presentations and infographics

Bleach is an allowed-list-based HTML sanitizing library that escapes or strips markup and attributes

This is an Express view engine which renders React components on server. It renders static markup and *does not* support mounting those views on the client.

Python TUI framework with mouse support, modular widget system, customizable and rapid terminal markup language and more!

This is a lootfilter for the game "Path of Exile". It hides low value items, uses a markup-scheme and sounds to highlight expensive gear and is based on economy data mining.

A Swagger to AsciiDoc or Markdown converter to simplify the generation of an up-to-date RESTful API documentation by combining documentation that’s been hand-written with auto-generated API documentation.

HTML Inspector is a code quality tool to help you and your team write better markup. It's written in JavaScript and runs in the browser, so testing your HTML has never been easier.

Go Language Library for SVG generation

A light markup language

This CSS file intends to warn developers about possible risks and mistakes that exist in HTML code. It can also be used to roughly evaluate a site's quality by simply including it as an external stylesheet.