Maqetta Visual authoring of HTML5 user interfaces – in the browser! 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. (tags: software opensource javascript html5editor maqetta)

Pow Pow is a zero-config Rack server for Mac OS X. Have it serving your apps locally in under a minute. (tags: software opensource macosx rails rack webserver pow)

language agnostic – What are the lesser known but cool data structures ? – Stack Overflow content datastructures