Most of my useful contributions are fairly small, discrete modifications or additions. That's not to say I don't dream big sometimes, but I rarely finish my larger ideas.
For the most part, I 'brew for 3.5, or sometimes Pathfinder, as those are the systems I am most comfortable in. I also will often critique work done in those systems; if you want another eye on your work, feel free to PM me and I'll see what I can do.
If you use any of these, please drop me a line! I'd love to hear how they worked out. Also, if you have a suggestion but the thread's been idle past the necromancy mark, send me a PM about it and I'll see what I can do.
Works in Progress
Epic Spellcasting (3.5 fix) (like Monk or Fighter fixes, everybody has one)
Persevering Spell (3.5 metamagic fix) (persist is either too weak or too potent; here's a better try)
Will Points and other vague ideas (parallel to hit points; a rare system-wide change idea)
Enabling (Ex) Hypnosis (new skill usage)
Largely Complete
Equalization (a weapon for monks to use in restoring order and balance)
Replacing the Phylactery of Faithfulness (a magic item tax for something your character should be able to figure out doesn't make much sense)
Ranged Aid Another (the ability to fire volleys more intelligently)
Unambigously allowing psicrystals to manifest and focus (because some DMs don't like the funkiness of letting psicrystals take psionic feats without restriction)
A Hidden Stairway of Light (spell inspired by those fictional hard-to-see paths only a believer can tread)
Turn concealment into flat AC bonus (a houserule with some significant ramifications)
Stacking Resist Energy (a spell to deal with that annoying interaction with protection from energy)
Rogue-friendly Knock/Find Traps replacements (simple spell fixes)
Reducing Friendly Fire (metamagic feat + ritual)
Maze of Sleepy Repletion (a spell to emulate The Hobbit, in Mirkwood)
Buried in History/Lorewhelm (two spells for that bookworm in your group)
Silly
Gummi Bears (3.5 joke monster) (Exactly What It Says On The Tin)
New alignment system (D&D any) (a satire against reductionist alignment solutions)