GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.
MkDocs - Project documentation with Markdown.
Wordd - Quickly look up vocabulary, abbreviations, acronyms, slang
Docusaurus - Easy to maintain open source documentation websites
Word of The Hour - Easily expand your vocabulary with a new word, every hour 🕖