Offhand I know of
Seiklus a Game Maker based platformer by clysm
Meritous a weird mashup of shmup and dungeon crawl by Lancer-X
Aftershocked! a point and click adventure by MadGuy
Between Heaven and Hell a sidescroller in the style of Out of This World/Another World, also by MadGuy
Contingency 88 a puzzle game based around gerrymandering an election, by me

Crystal Towers 2 a weird Genesis-era like platformer and probably a million tiny side games, by DavidN
(I don't think it's what I'm really looking for here, but also Exophase was repsonsible for the GBA emulator used for homebrewed PSPs.)