The Online Compiler!

jsFiddle lets one easily test snippets of JavaScript/CSS/HTML code on-the-fly, adding optional libraries like jQuery.

ideone.com is a... pastebin. But a pastebin like no other on the Internet. More accurate expression would be "online mini IDE and debugging tool".

Examine, edit, and debug HTML, CSS, and JavaScript on the desktop and on mobile.

Codeanywhere is a code editor in a browser with a powerful ftp client integrated, and all popular web formats are supported (HTML, PHP, JavaScript, CSS, and XML).

Online Interpreters in JavaScript. Online coding and REPL. Run and share code. Try QBasic, Forth, Ruby, Python, Lua, Scheme, Emoticon, Brainfuck, LOLCODE, Unlambda, Bloop, JavaScript, Javascript.next, Move, Kaffeine, CoffeeScript, Roy programming languages.

PythonAnywhere is a Python development and hosting environment that displays in your web browser and runs on cloud servers. The servers are already set up with everything you need: hundreds of useful Python packages and web frameworks are supported out of the box.

Compile and Execute your favorite programming languages online, click any of the following to proceed! Web Technologies, Text Formatting, Useful Utilities, Programming Languages. Vim, emacs modes are avaliable.

Online-php.com is a free online IDE for editing files on an FTP server. The application was created for fast, free, simple and convenient read/write access to the files on FTP server. Sometimes, for some purposes, the direct FTP access is blocked and there is no conventional way to access the files on the server. This is the main reason for this WebApp.

Instantly write and execute code collaboratively with a candidate, right in the browser. CodeBunny provides a Realtime Collaborative Editorwith in-browser Code Execution and REPL (read-eval-print-loop) shells. CodeBunny is an Online Compiler and Interpreter for PHP, Python, Ruby, Perl, Javascript, C, C++, Java, Clojure, R, Scala, Coffeescript. Ideal for Phone Screen/Online Interview of Developers. CodeBunny also enabled video chatting with Google Hangouts.

CodeBunk provides a Realtime Collaborative Editor with Compile/Run. CodeBunk is an Online Compiler/Interpreter for PHP, Python, Ruby, Perl, Lua, Javascript, C, C++. CodeBunk also has Peer-to-Peer Video/Audio chat facility. CodeBunk is ideal for Online Interview of Developers as well as Learning to code from Friends.

OnlineGDB.com is an online compiler and debugger tool for C/C++ languages. It is world's first online IDE which gives debugging facility with embedded gdb debugger. This is very handy webapp for coders who loves coding in online IDE but faces unexpected crashes and tricky bugs in their code. OnlineGDB provides debugging power to such users to help them out.

A web-based IDE to teach programming in the classroom. Easily create and share exercises with students. Analyze and inspect students' submissions