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

Liveweave is a HTML5, CSS3 & JavaScript playground for web developers and designers

Online playground for testing and sharing HTML, CSS and JavaScript code snippets. Enter your code in the three appropriate panes and see live how it all comes together. You can …

An interactive CSS playground and code sharing tool. Dabblet saves to Github gists and offers many conveniences for CSS editing.

Very simple webpage with a simple textbox, a checkbox for selecting one of several languages and an option to make it private and to run the code or not. Has …

CSSDesk is a online HTML/CSS sandbox. Experiment with CSS, see the results live, and share your code with others.

Tinkerbin lets you play around with HTML, JavaScript and CSS without creating files or uploading to servers.

An online playground with an instantly ready coding environment that supports several language preprocessors, CSS, HTML and JavaScript.

Plunker is an online community for creating, collaborating on and sharing your web development ideas.

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...

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,...

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.