Markdown by DaringFireball - Text-to-HTML conversion tool/syntax for web writers, by John Gruber
pandoc - Pandoc is a Haskell library for converting from one markup format to another, and a command-line...
txt2tags - It reads a text file with minimal markup such as **bold** and //italic// and converts it to the...
Docutils - Docutils is an open-source text processing system for processing plaintext documentation into...
Texy! - Texy! is a lightweight markup language as well as converter of this format to XHTML, in a form of a...
Asciidoctor - In the spirit of free software, everyone is encouraged to help improve this project.