mdbook - Gitbook alternative in Rust
Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.
MkDocs - Project documentation with Markdown.
JavaScript - Lightweight, interpreted, object-oriented language with first-class functions
GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
Java - A concurrent, class-based, object-oriented, language specifically designed to have as few implementation dependencies as possible