Update: 08/12/2011
For those of you in my CTY Session II, FCPS B class: Here are the links to the software we used this summer.

• Python 2.7, necessary for Python programming. Direct download link for windows users: http://python.org/ftp/python/2.7.2/python-2.7.2.msi. (Python 3.x is slightly different from 2.7, most notably in how the print command works. Also, many 3rd-party libraries haven't been updated for 3.x so they can't be used.) See http://docs.python.org/ for more about Python.
• Eclipse, useful but not necessary. Other programming environments exist. The classic edition is fine, but burried beneath many clicks, so here's a direct link. The Pydev extension is needed to use Eclipse for Python programing.
• Logic Gate Simulator, a neat program for playing with logic circuits.
• JFLAP, a program for simulating finite automata, Turing machines, and more.

In addition, here are some Python demo programs showcasing some of what we worked with during class.

• enumerator.py -- recursive string enumerator
• fractals.py -- demo of several different fractals including the Sierpinski triangle and Pythagoras tree
• steg.py -- requires the Python Imaging Library. Run it on this picture to extract a hidden message.
• quine.py -- a tiny program that outputs itself