Open-source HelpNDoc alternatives

Pandoc is a universal markup converter, made up of a Haskell library that translates content between markup formats and a command-line tool built on it. It can read a very wide range of formats, including AsciiDoc, BibTeX, CommonMark, DocBook, Word docx, EPUB, HTML, Jupyter notebooks, LaTeX, several Markdown variants, MediaWiki, Org mode, reStructuredText, Textile and Typst. It is released under the GPL-2.0 license.

Beyond the built-in readers and writers, the documentation describes custom readers and writers written in Lua. Pandoc can also write to many output formats, such as HTML, docx, EPUB and LaTeX. Its topics reference publishing, presentations and CommonMark, reflecting its use in academic writing and document pipelines.

Because it is a command-line tool and a library, Pandoc is easy to script and to embed in build systems, static-site generators and writing workflows. It suits writers, researchers, documentation teams and developers who need to move content between Markdown, Word, web and print formats without retyping.

Quarkdown is a modern typesetting system based on Markdown. A single project can compile into a print-ready book, an academic paper, a knowledge base or an interactive presentation, so writers can reuse one source across several formats. It is written in Kotlin and builds on CommonMark and GitHub Flavored Markdown.

What sets it apart is that it extends Markdown into a Turing-complete language. Syntax additions let you call functions, and an expanding standard library provides layout builders, input and output, math, conditional statements and loops. You can also define your own functions and variables entirely within Markdown. Editor extensions are available, and the README covers installation, quickstart, creating a project, compiling to different targets, a demo and a comparison with other tools. PDF output is among the targets, as topics for papers and slides suggest.

Quarkdown is licensed under GPL-3.0 and installed locally, so there is no hosted service to depend on. It appeals to academics, technical writers and educators who want programmable documents with better layout control than plain Markdown, without moving to LaTeX.

Gramax is a free, open-source application for creating, editing and publishing documentation as code. It stores all data locally in Markdown, so it works offline and files can be edited in any text editor, and it integrates with Git for version control and collaboration. It targets product documentation portals, internal knowledge bases, project documentation and personal notes.

A visual editor makes Markdown editing easier for technical and non-technical users. The app runs on Windows, macOS and Linux as a desktop app and as a web version. Editing features include tabs, tables, video embeds, code blocks, diagrams from Mermaid, Excalidraw and Diagrams.net, and Swagger API descriptions. Git repositories on GitHub, GitLab, Bitbucket, Gitea and others can be connected, catalogs can be published to a customizable documentation portal, documentation can be written in 17 languages, and content can be imported from Confluence and Notion.

Gramax is positioned as an alternative to GitBook, Mintlify and typical static site generators. It is written in TypeScript and Rust with Tauri, and licensed under GPL-3.0.