Looking for *extremely* low graphics FPS games.

Alpha Prime? Maybe?

SG is too slow to let me check all the pages, so here goes my tongue in cheeck recommendation, although it is not technically an FPS: 0verkill

Otherwise: War§ow, Tremulous, Open Arena are all awesome. And free!

UT99

UT2004

Quake

Xonotic

CS1.6

Return to castle Wolfenstein

You could try http://en.wikipedia.org/wiki/.kkrieger at least you'll have enough hard drive !

hate to say but first thing came to my mind is minecraft with a bow

The Jedi Knight Collection

Postal 2 I guess.

Since nobody has said the following:

Grab the apogee pack. It has the original (Extreme) Rise of the Triad and the 2 Blake Stone games. Keep in mind Blake Stone games are from the days of Wolfenstein 3D, and ROTT not so far off from them.

Awesome games.

Call of duty Ghosts should fit the titles description, you could try Modern Warfare 2, Black ops, Modern Warfare 3, Black Ops 2, but I don't know how bad your PC is. They do look better than ghost but still pretty poor, so you might give it a try?

Brutal Doom

Shadow Warrior, Duke Nukem 3d, System Shock 2, Thief and Deus Ex are still amazing games and among the best FPS ever made.
Also check Brutal Doom that I've been told is a great improvement over the original but I still haven't tried it.

Edit: How could I forget Halflife?

Warsow . Is free game like Quake 3

You could probably run Guncraft and Ace of Spades pretty well. You should also check out Receiver, it's kinda short, but pretty dang good.

VVVVVV

Quake II <3

DayZ

System Shock 1. It's fantastic.

Grab a new gpu for about 50 € and you can pretty much cover most less demanding games

Edit: Mainwhile id go for Serious Sam (first & second encounter)

stubbs the zombie,u can run it on max.
Loads of fun :)

edit: here was a keydrop. you're welcome ;)

Insurgency. Its a new game based on a HL2 mod.

I'd say that Vampire the Masquerade: Bloodlines would be up your alley. It's a Source Engine mod. The original Deus Ex is excellent and cheap too. My favourite game of all time is Quake II. Far Cry 1 might be good too if you like open world games.

8-bit Killer: http://www.locomalito.com/8bit_killer.php Great game and free. :)

system shock 2 should work fine on that system, is more than worth playing, and is cheap (and has no drm if you decide to go that way)