Wiki for the Seed RPG system, and several of its spiritual successors (some of which were more complete than others).
Feature Complete:
Seed RPG A large system heavily influenced by Final Fantasy, with many mechanical modules you can mix and match together to best fit each campaign.
Gem System A system mod to Seed1 which was built for a specific Mana Series inspired campaign. Both a different Growth and Equipment system (and one extra attribute),
SeeD OVERDRIVE A stand alone system without ties to Real IPs, built with smaller numbers and tighter class design in mind. (Seed3, for those keeping track!)
SeeD-lit(k)e An entirely combat and dungeon exploration focused system, based on roguelites, but with a party. (Inspired by a lot of random things that are fairly different, like Slay the Spire, X-Com Chimera Squad, and Visions of Mana)
Mostly Complete But Missing Some Things:
Seed 2 Direct successor to Seed1, which was a bit of an evolution from the Gem System and built with custom classes and flavored by its creators rather than relying on Final Fantasy.
Works In Progress That May Or May Not See More Work
Mecha SeeD SciFi Combat Mechs.
Seed Modern Urban Fantasy rather than SciFi fantasy, and classless.
SeeD-vilization A tabletop x4 boardgame, rather than a roleplaying RPG system!