Cairo

A Windows Shell Alternative, Cairo is a revolutionary desktop environment for Windows. The goal is to develop a desktop experience that increases productivity and advances current technology standards. With a focus on stability, performance, and productivity, Cairo is sure to turn a few heads. In the next week or so the Cairo Development Team will be releasing the first milestone build of Cairo, tentatively named Cairo Milestone 1. Sign up to be a tester before the release is widely available.

http://www.cairoshell.com/

Chickenfoot

Chickenfoot is a Firefox extension that puts a programming environment in the browser sidebar so you can write scripts to manipulate web pages and automate web browsing. In Chickenfoot, scripts are written in a superset of Javascript that includes special functions specific to web tasks.

http://groups.csail.mit.edu/