I just beat Marlow Briggs! Let's see...
Blast Corps. N64 not-quite-launch title from Rare where you must demolish buildings before a runaway missile carrier wipes out on them. Quickly devolves into a surreal time-trial puzzle driving sim. And you go to space, in a dump truck.
Star Soldier: Vanishing Earth. The only entry in the Star Soldier franchise WITHOUT a crazy cult following, possibly because it is WAY WAY EASIER than any other Star Soldier game. Still fun. Noteworthy for a level where you must guard a space shuttle while it is being launched, in spite of the player and his army having FTL space fighters and the like. On a side tangent what was with N64 games and space shuttles? You save them in VE, Goldeneye, Aerofighters Assault, and the aforementioned Blast Corps, and I think a couple show up in Sin and Punishment too. Hey, speaking of that-
Sin and Punishment. It's Space Harrier made by Treasure and it's awesome. I think it's on the virtual console.
Nightstone. A shitty diablo clone from Germany. All the classes are horrible, there's a stealth mechanic that you have no need to ever use, and spider enemies can outrun wolves. Released in glorious 2D in spite of coming out well into the 3D era.
Nox. A GOOD diablo clone by Westwood. I believe it's public domain now. Nox has a forgettable campaign; the most memorable thing about it is its deathmatch mode in which players build a mid-level character than run around arenas setting traps, sniping, and looting. It even had primitive debris physics and ray-traced LOS. Every MOBA owes something to Nox, even if they don't talk about it.
Soul Bringer. A classic-style 3/4 RPG released by Epic in the dark days before Unreal. Noteable for being in 3D but using sprites for each part of a character- so your dude's head is a sprite, then his torso is another, and his arms are like 3. They all rotate kind of on their own and sometimes they drift apart. It's unsettling as hell, especially on the "hot girl" barmaid model.
CyClones. The game that put Raven on the map. Using an engine similar to Duke Nukem, you play a cyborg commando who- look, it's basically a serious Blood Dragon that runs in DOS, okay? Notable for having an inventory and for inventing those rotating black robots with all the red eyes that show up in like every single Raven game.
Strife. It's an action RPG made in the Doom engine. It's actually REALLY FUN, but it's very unstable and most modern Doom VMs and engine rebuilds don't seem to support it.
Damage Incorporated. Real-world action game built on the Marathon engine that sees the player direct a squad of marines in counter-terrorism operations. Think Rainbow 6 with no Z-axis to speak of. Had an awesome opening theme, tons of guys to recruit, and amazingly gory deaths (especially from the corrosive shotgun rounds).
Arcade Mario 1. NOT the playchoice release, this was a modified rom with support for score tables and the like. Since it was rebuilt for arcade play, most 1-up mushrooms and shortcuts were removed, making it kind of the Hardmode Super Mario Brothers.
Arcade Battletoads. And yeah, it's harder than the NES one.