Online Coding Environments

IDE's (Online)

Try It Online
Online compiler for several practical and recreational programming languages.

Ideone
An online compiler and debugging tool which allows you to compile source code and execute it online in more than 60 programming languages.

Codenvy
Self-service Eclipse Che workspaces.

Coding Ground - TutorialsPoint
Code in almost all popular languages using Coding Ground. Edit, compile, execute and share your projects, 100% cloud.

Fiddles

PhpFiddle
PhpFiddle provides Web IDE, Web Tools, APIs, Widgets, PHP Libraries, programming resources and execution environment for PHP/MySQL/SQLite, HTML/CSS and JavaScript coding online. PhpFiddle allows people to test PHP code snippets, create, execute and download web applications, for example, Zend Framework 2 projects.

.NET Fiddle
NET sandbox for developers to quickly try out code and share code snippets.

JSFiddle
Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle code editor.

SQL Fiddle
A tool for easy online testing and sharing of database problems and their solutions.

Python Fiddle
The Python IDE for the web. Play around with and modify live example code. Share or demonstrate solutions to problems.

R-Fiddle
share code snippets or makie your own variations on others people code.

Go Playground
Nice an clean environment for trying out Go, the statically typed language developed originally at Google.