Full Screen Mario is a fully HTML5 remake of the original Super Mario Brothers. You can play the original levels, play through some of literally millions of possible random maps, or create your own using the level editor. This whole project is open source and free - if you would like to use the code, check out the Github.
Just opening the site, and hearing the theme of mario- Worth it!
SyntaxHighlighter is a fully functional self-contained code syntax highlighter developed in JavaScript. To get an idea of what SyntaxHighlighter is capable of, have a look at the demo page.
Supported languages-
A new way to teach and learn html/css/js. Basically, you just need to write HTML, CSS, Javascript code inside code editors and it'll record whatever you type. Other people can then "playback" your recording in a video style and learn how you made your creation.
Another part of CSSDeck is the Creations gallery (which is what it started with). If you ever made something cool with CSS/JS just submit it and we'll showcase it in the gallery. It's purely for educational and inspiration purposes.
Last but not the least, you can make testcases and share with other people who can help you out solve your coding problems. You can also collaborate with them in realtime and code collaboratively.
Site: CSSDeck
Check out the Documentation.