CodePen ist eine neue Community zum Entdecken und Teilen von Code-Snippets in HTML, CSS und JavaScript mit Vorschau sowie Editor im Browser.
Convert CSS Snippets to Syntactically Awesome StyleSheets code
JsFiddle is a playground for web developers, a tool which may be used in many ways. One can use it as an online editor for snippets build from HTML, CSS and JavaScript. The code can then be shared with others, embedded on a blog, etc. Using this approach, JavaScript developers can very easily isolate bugs. We aim to support all actively developed frameworks - it helps with testing compatibility.
Maqetta is an open source project that provides WYSIWYG visual authoring of HTML5 user interfaces. The Maqetta application itself is authored in HTML, and therefore runs in the browser without requiring additional plugins or downloads.
Optimizing images by hand is time consuming and painful. Smush it does it for you.