Python

There are many Python IDEs around however I think that Wing is the most polished one. It also includes a debugger and nice context help. Although it is shareware, there is a free version which doesn't require a license. You can download a copy from here: http://wingware.com/downloads/wingide-101/installers. You can install it on both 32/64 bit systems, by forcing architecture installation:

sudo dpkg -i --force-architecture wingide-101-3.1_3.1.3-1_i386.deb