online games freewareAnybody know of good non internet/online based fps freeware games?

freeware non-online games fps
I imagine you mean fps games with single-player modes? Yes, you're in luck, I know all the best ones. These mostly have online multiplayer also, but you can do single player too.

There are a few that are only single-player, I'll list what I can think of.

Open Arena: this is Quake3. It's a free, open-source version. You can play on quake servers but you can also fight against bots on your own computer.

Sauerbraten: There are lots of single-player maps on this one, because it's easy for users to create them. You have a virtual map editor, you can just go into edit mode and fly around and build the terrain, weapons, powerups, monsters, objects, water, walls, etc.

AssaultCube: similar to Sauerbraten, different single-player maps.

Cube: the two previous oonline games freewarenes are based on this one, again you may as well look cause its maps are different.

Marathon: AlephOne - this one is a bit old and may not impress you but it's better than Doom, so maybe it'll be interesting. It has to be compiled from source. If you don't know how to do that, it's a great opportunity to learn a new skill. There's also Marathon 2 and one other title.

Quake 2: Why bother with Quake2 when Open Arena already is a clone of quake 3? because there's lots of single-player mods for quake2 engine. In fact it's the most-used fps engine for open-source games, except maybe the Unreal engine. For that matter there's lots of open-source single-player Doom content, but I figure you don't want anything that old.

The Hunted: This one is single-player only, in case you're a kid whose parenonline games freewarets won't let them have an online-capable game. It's a horror shooter though.

Transfusion: on the same engine as The Hunted, also a single-player only game.

If you can get ahold of the unreal engine, which supposedly is open-source now, there are a lot of good single-player mods for it, including America's Army, which is mostly online though you can go through training in singleplayer.

There are tons of mods for quake2. You can find most of the stuff I've listed at the linux game tome, www.happypenguin.org. Don't worry, I only listed stuff with windows versions.
trans fusion does not have a single player mode yet it is still in devolepment