Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.
Sass - Syntatically Awesome Style Sheets
JavaScript - Lightweight, interpreted, object-oriented language with first-class functions
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.
PHP - A popular general-purpose scripting language that is especially suited to web development
Stylus - EXPRESSIVE, DYNAMIC, ROBUST CSS