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.
Yellow Lab Tools : Online test to help speeding up heavy web pages
Carbon : Create and share beautiful images of your source code.
Start typing, or drop a file into the text area to get started.
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.