ideone.com : Ideone is an online compiler and debugging tool which allows youto compile source code and execute it online in more than 60 programming languages.
Insight.io : Insight.io brings IDE-like code intelligence features such as cross-reference, class hierarchy and semantic search, right into your browser and helps ...
MindMeister : MindMeister is an online mind mapping tool that lets you capture, develop and share ideas visually.
Powerful and simple online compiler, IDE, interpreter, and REPL. Code, compile, and run code in 30+ programming languages. including JavaScript, Python, Ruby, Java, Node.js, Go, Scheme, C, C#, C++, Lua and many more.