Online IDE supporting most popular languages
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[Account] - Cloud workspace for developers, supports most popular stacks including Android, Hadoop, Selenium, NodeJS and lots more
Online terminals for Ipython, Octave, Powershell, Redis and lots others. Also has a good collection of IDEs for programming languages
An online C/C++ compiler with multiple files supporting feature, GitHub(gist) integration and collaborative editing
Simple single file code compiler supporting major languages