Off the top of my head...I realize this community is probably D&D focused, but I'm curious what systems you've used for long term campaigns? Are there others you've bought and never played, though you may mine them for ideas? Is there something that I haven't given a fair shot that is your favorite system?
I’ve been in long-term campigns with these systems:
Basic D&D
AD&D, a.k.a. 1Ed
2Ed
3Ed
3.5Ed
4Ed
Champions/HERO
HERO 4th
HERO 5th
Classic Traveller
RIFTS/Heroes Unlimited
GURPS 2Ed
Stormbringer
Paranoia
Games I own and haven’t used for a long term campaign or not at all are too many to name. But some highlights:
Space:1889
The Fantasy Trip
Deadlands
Deadlands D20
Prime Directive
Brave New World
Aberrant
Silver Age Sentinels
Savage Worlds
Torg
ACE
Werewolf
Vampire the Masquerade
Mage: the Awakening
Changeling
Mummy
Scion: Hero
Scion: God
Mutants & Masterminds 1 & 2
Midnight 2nd
True20
FantasyCraft
Spycraft
Arcana Unearthed/Arcana Evolved
Pathfinder
Earthdawn
Shadowrun
Alternity
Star Wars D20
D20 Modern
D20 Future
Numenara/Cypher System
Call of Cthulhu
Call of Cthulhu D20
Godlike
Spaceship Zero
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