Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.
Sass - Syntatically Awesome Style Sheets
Rust - A safe, concurrent, practical language
PostCSS - Increase code readability. Add vendor prefixes to CSS rules using values from Can I Use. Autoprefixer will use the data based on current browser popularity and property support to apply prefixes for you.
Java - A concurrent, class-based, object-oriented, language specifically designed to have as few implementation dependencies as possible
Stylus - EXPRESSIVE, DYNAMIC, ROBUST CSS