Evolution resources: 29 Evidences For Evolution http://www.talkorigins.org/faqs/comdesc/ The Critique http://www.trueorigin.org/theobald1a.asp
Physics http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=36 <-- Java sim of a particle in an arbitrary EM field http://www.physics.uoguelph.ca/applets/ <-- various Java sims
Programming http://www.daniweb.com/category2.html - various languages http://www.devarticles.com/ - various languages http://www.devshed.com/ - various languages http://effbot.org/zone/ - Python http://www.webmonkey.com - various languages Mathematics http://aleph0.clarku.edu/~djoyce/java/elements/elements.html - Euclid's Elements, with Java applets
Astronomy & Astrophysics http://www.lightandmatter.com/planetfinder/en/ - Java applet that shows the positions of planets, stars, and Moon in the sky for a given location, date, and time Mathematics(?) http://incompetech.com/graphpaper/ - Various types of graphing paper that can be freely printed off Language http://www.doubletongued.org/index.php/dictionary/guide/ - Words that are not found in "mainstream dictionaries"