Core Class Rebalance
Monk [this was the first class I attempted to fix, and after working on the other classes a bit, I've realized that while an improvement over the RAW, this class is still not ideal]
Revised Combat Manuevers
Alternate rules for Aging
making cross-class skills more workable, less painful
because the RAW armor is kinda "meh"
A magic fix for 3.5 and 3.PF
My largest project to date, and still ongoing because I am rewritting almost every spell written for 3.5. Come check it out when you have some free time!