NoScript for Firefox pre-emptively blocks malicious scripts.

AddThis is a social bookmarking service that can be integrated into a website with the use of a web widget.

Livebrush is a simple drawing program with a lot of potential.

Flashblock is a content-filtering Firefox extension for Mozilla Firefox and SeaMonkey.

BetterPrivacy deletes Flash/Super cookies on exit.

Adobe Flash Builder offers built-in code editors for MXML and ActionScript and a WYSIWYG editor for modifying MXML applications.