Coding Ground!

Pastebin.com is a website where you can store text for a certain period of time. The website is mainly used by programmers to store pieces of sources code or configuration information, but anyone is more than welcome to paste any type of text. The idea behind the site is to make it more convenient for people to share large amounts of text online. Users have the ability to make private pastings, so they are only visible to the people they choose to share their links with.

The Google Chrome Developer Tools provide an integrated environment for debugging, optimizing, and understanding a web application, or website, running in Google Chrome. The developer tools are developed partly through the WebKit open source project, where the tools are called Web Inspector.

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 easily share and fork your own or others creations.

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 popular JS libs from a menu, so you don't have to remember the URL.

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.

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.

kodeWeave is a realtime coding playground for HTML, CSS and Javascript. Similar to JSFiddle and JSBin, but kodeWeave was made to work offline but also as a prototyping application to build applications for desktop operating systems while on mobile devices. (PhoneGap Build is recommended for mobile devices)

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

dabblet is an interactive playground for quickly testing snippets of CSS and HTML code. It uses -prefix-free, so that you won't have to add any prefixes in your CSS code. You can save your work in Github gists, embed it in other websites and share it with others.

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

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.

Webmaker - teach your self to code for the web.

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