1. JavaScript

    Lightweight, interpreted, object-oriented language with first-class functions

  2. HTML5

    5th major revision of the core language of the World Wide Web

  3. PHP

    A popular general-purpose scripting language that is especially suited to web development

  4. Python

    Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.

  5. Java

    A concurrent, class-based, object-oriented, language specifically designed to have as few implementation dependencies as possible

  6. Ruby

    A dynamic, interpreted, open source programming language with a focus on simplicity and productivity

  7. C

    One of the most widely used programming languages of all time

  8. Swift

    Swift is a general-purpose, multi-paradigm, compiled programming language developed by Apple Inc. for iOS, macOS, watchOS, tvOS, Linux and z/OS.

  9. Objective-C

    The primary programming language you use when writing software for OS X and iOS

  10. Markdown by DaringFireball

    Text-to-HTML conversion tool/syntax for web writers, by John Gruber

  11. Scala Lang

    Scala is a pure-bred object-oriented language that runs on the JVM

  12. Elixir

    Dynamic, functional language designed for building scalable and maintainable applications