Docutils

Text processing system for processing plaintext documentation into useful formats, such as HTML, LaTeX, man-pages, open-document or XML. Designed to work flexibly with text in multiple languages (one language at a time). Language-specific features are fully parameterized.

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First released 2004
Developed by Docutils
Open-source Yes

Interesting facts

The docutils Python library includes a tool called rst2html which converts plain text to html. rst is a plaintext format where you can use ascii to also put headings and bullet lists and stuff, but it also works  just for plain text where you only have paragraphs.

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Development by Synergize.digital