Hmmm, well there would be a lot from me, but I'm older than a lot of people who post here so that might have something to do with it. Some of my favorites include:
1. Wizards and Warriors: an old RPG in the vein of Wizardry, not the oldest thing on this list, but when I mention it most people think of the NES carts. I had some fun with this, but wound up losing it. Haven't been able to find a copy of it digitally, but it has been a while since I've looked.
2. Noctropolis: I'm not a big adventure game player, but Origin Systems/Richard Garriot did this adventure game about a comic fan running a used book store who gets sucked into a parallel reality where he has to step in to replace his favorite super hero. One of those games that used live people playing the roles when that was a hip new technology. I always kind of hoped for a sequel and to do more with the villains (since I didn't feel like I actually defeated most of them) but it didn't do anywhere well enough for them to consider I guess.
3. Cybermage: Darklight Awakening: The guys who did Wizardry did this one too, it was an attempt to create a FPS with other elements in it. This was one where you had powers, guns, and fairly open levels in places, along with side objectives. I always felt this game and another one by Origin called "Shadowcaster" innovated a lot of the things later FPS games wound up taking credit for.
4. Bloodnet: This was kind of like the wierd cousin of "Challenge Of The Five Realms". It's an adventure game/RPG hybrid where you play a computer hacker in a cyberpunk world who gets turned into a vampire. You need to recruit a bunch of fellow cyberpunks Ultima style and put together a team to take down the head Vampire before you become a full Vampire and lose your humanity. It was differant at the time, especially seeing as Vampire-mania had yet to fully set in. While this was inspired by the old "Grimms Cybertales" supplement for "Cyperpunk 2020" (or so it seemed) I have kind of wondered how many later works it wound up inspiring because every once in a while I can't help but think "you know that sounds almost like an intentional Bloodnet referance".
Of course then again I'm the guy who thinks gaming peaked with "Ultima 7" and "Crusaders Of The Dark Savant" as one year's RPG one-two punch, back when a 386 was a monster machine. Sadly, creativity wise it seems to have been gradually down hill, especially for RPGs. I kind of hope Richard Garriot gets something out soon, despite the layoffs, and somehow manages to start a new gaming renaissance.
