Fiddle Salad

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

JS Bin is a collaborative open source JavaScript debugging tool. Enter Javascript in one pane and HTML in the other and see the result; share using a short URL. Choose …

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

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

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.

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

Sometimes it's just easier to code your website, effect, application, or merely just experiment with automatic updates like on jsbin.com or liveweave.com. So if that's what you're looking for this...

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

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,...

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...