Description: Duolingo is a free language-learning platform that offers over 100 total courses across more than 30 languages. The bite-sized lessons make it easy to learn a new language through fun, quick activities on your phone, tablet, or computer.
Type: software
Pricing: Freemium
Description: Try It Online (TIO) is an online code playground and collaborative tool that allows you to quickly test snippets of code in over 600+ programming languages. It has a simple interface with an editor on the left and a console output on the right.
Type: software
Pricing: Open Source