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

Describing Chinese Characters with Recursive Radical Packing Language (RRPL)

Scroll is a language for scientists of all ages. Scroll includes a command line app that builds static blogs, websites, CSVs, text files, and more.

DEPRECATED: Atomic UI Framework based on Web Components and Runtime CSS Generation for rapidly building interfaces that follow your Design System 🌈DE

The best way to publish your scientific knowledge. Source code for the entire OurBigBook Project: OurBigBook.com, ourbigbook CLI and the VS Code extension. A powerful static wiki generator and lightweight markup language to write complex structured wikis/books/blogs with multi-user mind-melding magic 🧙

Powerful markup language for modern chatbots.

Easy MathML authoring tool with a quick to write syntax

🎶 Markup language for music creation and analysis! -- https://hlorenzi.github.io/musicode/

Kaku - 書く - A markup language I did for myself

A markup language that fits in with CSS and JavaScript and outputs HTML.

📝 A easy and friendly markup language for documentation and academic purposes!

A post-Markdown lightweight markup language with visual mnemonics and human-centered design.

Open source lightweight screenwriting software by using a markup language.

A JavaScript Markup Language in JavaScript to easily create DOM elements.

Javascript implementation of AbstractMark

Alex Speech Synthesis Markup language generator. Makes it easy to do all the things

Zolto is a next-generation educational markup language.

A tag-based programming language inspired by HTML, designed to make markup actually programmable.

Milestone-based XML markup for the Qur'an, modeled on the Bible's USX/USFM standard

Text-based wireframing format that embeds in markdown like Mermaid. Familiar component names, indented to show containment, rendered in a hand-drawn style. Agent-first — trivial for LLMs to read and write.