TextWrangler is an all-purpose text and code editor for Mac OS X, based on the same award-winning technology as BBEdit.

PythonAnywhere is an online Integrated Development Environment (IDE) and Web hosting service based on the Python programming language.

W3Schools is a popular web site for learning web technologies online.

TweakStyle is an advanced Code editor for creating and customizing the Web.

Codility.com is a platform to hire developers and other resources.

Snippets stores the most valuable pieces of code you can reuse in different projects many times.

repl.it is a cloud coding environment.

CodeCloud.me is a platform for learning programming.

Tutorialspoint provides free tutorials online.

Collabedit is an online code editor that lets people collaborate in real-time.

CodeHS is an interactive online learning platform offering computer science and programming instruction.