Educational coding platform which allows users to code competitively alongside others.

Interactive learning platform which teaches a wide variety of coding courses, some for free.

Provides an online library of coding challenges for skill improvement, plus interview preparation training online for programming positions.

Course which offers free programming training in HTML, CSS and javascript.

Online coding school which provides a basic curriculum followed by hands-on experience coding for non-profits.

Gives details of this certificate course in programming offered by Harvard, with information on how to get started.

Features a wide range of free online programming courses from this educational platform.

Presents the range of free online programming courses provided by MIT, including language-specific courses.

Provides a free, open source coding curriculum which can be taken entirely online.

Offers free online courses in Ruby at beginner, intermediate and advanced levels.