Web-based Sandbox Tools for Testing Your Code Snippets 1

Tinkerbin
can run HTML, CSS and JavaScript, as well as CSS and JavaScript abstraction languages/metalanguages like SASS and CoffeeScript.

JS Bin
JavaScript/HTML code-testing tool. ability to reference (include) popular open source libraries like jQuery, MooTools, YUI, Modernizr, etc.

JS Fiddle
a free sandbox tool for HTML, CSS and JS. ability to reference popular JS libraries/frameworks like jQuery, YUI and MooTools and an Ajax-request-testing functionality for simulating asynchronous calls for your code. command for running JSLint that can check your JavaScript for code quality and the "Tidy Up" code-formatting command for re-indenting your code.
Similar: Kodtest, LiveWeave

CSSDesk
online CSS/HTML sandbox tool is a slick way of testing snippets of your style sheet and markup. You have the option of changing the background of the preview pane.

jsdo.it
sandboxing tool emphasizes on community engagement and collaboration, with features that easily give you the opportunity to share your code on your social networks as well as within the site.

Tryit Editor Instant
If you don’t need all the features that the above tools offer and simply want one for quickly testing HTML, check this one out.
Similar: WriteCodeOnline

PractiCode
online code editor is a supplementary tool for Landofcode.com’s educational web design materials.

JavaScript Sandbox
uncomplicated tool for testing your JavaScript code snippets.

Google Code Playground
free APIs and services for things such as web fonts, Google Analytics and a content distribution network (CDN) for popular, open source JavaScript libraries (such as jQuery), and others.


http://htmledit.squarefree.com/
A very simple HTML previewing tool
Similar: html5snippet

WriteCodeOnline
javascript, php, url encoder.

Online PHP IDE
a free online IDE for editing files on an FTP server.

Full Function Programming Editor

Koding
AmyEditor
ShiftEditCodePen

Others:
SQL Fiddle
which works in the same way, except for SQL database syntax. I have yet to find another alternative for testing database code and this is by far my favorite choice.

Runnable
Full-stack code anyone can run from their browser

Reference:
http://sixrevisions.com/
http://www.hongkiat.com/