I’ve been using this open-source program for a few months now and I’m impressed.  For javascript and jquery coding its simply to best out there.  I like to code in the dark (or as dark as an office will allow) and the gray background on the GUI is really easy on the eyes, especially after coding for  hours on end.  If you are in development this is must have in my opinion.

Website and Download Link: www.aptana.com