CodeBunk

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 …

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 …

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

Add CSS styles to any website, and share the result with a short link Invite others to submit improvements for your website

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

Compile Run Execute Share Save Java program online, jvm online, java compiler online, java online editor, online java IDE

Test HTML / JavaScript / CSS snippets with real-time preview. You could also add libraries (jQuery, YUI etc.). Save your work with one click.

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

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 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,...