Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.
PHP - A popular general-purpose scripting language that is especially suited to web development
Java - A concurrent, class-based, object-oriented, language specifically designed to have as few implementation dependencies as possible
HTML5 - 5th major revision of the core language of the World Wide Web
Rust - A safe, concurrent, practical language
Sass - Syntatically Awesome Style Sheets