Hard list to make, but here goes:
1. EVE online (not sure if it fits, read on)
2. TF2
Aaand that's about it im afraid.
EVE online really stands out from all because of the way they do it, they obviously have an old game, but they like to spice things up with new ideas with updates to the old systems in the game. Also the updates are free, well you have to pay a subscription fee (or not if your'e good), but its not like WoW where you pay monthly and have to pay for the expansions. The old way used to be 2 updates per year, but now they are rolling out a new system where there are more smaller gradual updates rather than 2 big ones, plus they listen to the community.
TF2, apart from the item nonsense that made the game unplayable as far as i see was good, free updates, new gamemodes, community driven too. If you ask me the game was perfect up until the scout update. But hey its Valve they break all their games after a while what can you do