Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
GitHub Flavored Markdown - GitHub uses "GitHub Flavored Markdown," or GFM, across the site--in issues, comments, and...
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
DocBook - DocBook is a schema (available in several languages including RELAX NG, SGML and XML DTDs, and W3C...
Slack - A messaging app for teams who see through the Earth!
pandoc - Pandoc is a Haskell library for converting from one markup format to another, and a command-line...