MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.
TiddlyWiki - a non-linear personal web notebook
Rust - A safe, concurrent, practical language
Confluence - Confluence is content collaboration software that changes how modern teams work
Java - A concurrent, class-based, object-oriented, language specifically designed to have as few implementation dependencies as possible