Gist is a simple way to share snippets and pastes with others. All gists are Git repositories, so they are automatically versioned, forkable and usable from Git. - gist.github.com
helpful tip: add some #tags in your descriptions, so that you can faster find your snippets e.g. via "gist"-plugin from Sublime Text
GistBox is the best interface to GitHub Gists. Organize your snippets with labels. Edit your code. Search by description. All in one speedy app. - www.gistboxapp.com
helpful tip: add the "GistBox Clipper"-Addon to Chrome
A front end web development playground. - codepen.io | cssdeck.com | jsfiddle.net
A (backend end) development playground. - ideone.com
A SQL playground. - sqlfiddle.com
A (AngularJS) development playground. - plnkr.co
A (Twitter Bootstrap) development playground. - www.bootply.com
A (Google) development playground. - code.google.com/apis/ajax/playground/
A collection of code snippets for web developers, including code for HTML, CSS, JavaScript, PHP, WordPress, jQuery, HTAccess, and more! - css-tricks.com/snippets
A collection of coding language and api snippets. Code snippets for html, css, javascript, jquery, php, sql, and facebook, instagram, twitter, google analytics, google maps, google charts, foursquare, wordpress, tumblr, last.fm and pinterest api. - snippetlib.com