Before I get this thing going, let me get the two important links out of the way.
http://forums.somethingawful.com/showthread.php?threadid=3397960 It gives a vague idea of what the game is like and goon opinions of the game.
Next, http://sourceforge.net/projects/redeclipse/files/redeclipse_1.0/
http://www.youtube.com/watch?v=mjHVb3z72tM
Now for everything else:

Red Eclipse is a first person shooter with a very hectic pace; sort of like unreal tournament, except less flashy. It's got a few different game modes like death match, team death match, capture the flag, hot potato, and capture the bomb. Each one of these game modes can be modified in a variety of ways via in game mutations like instagib, vampire, and a whole host of others.

Each weapon comes built in with an alt-fire mode, except the pistol just seems to be a pistol either way you shoot it. I haven't really bothered with that weapon.
ANYWAY, the list of weapons you get to maim each other with is:
-pistol-rapid fire pistol
-shotgun-pellet bomb
-flamethrower-napalm shot
-plasma pistol-lightning vortex
-rifle-sniper rifle
-smg-thumper (think of the thumper's from borderlands.)
-sword-sword. (The alt fire just slashes the sword vertically instead of horizontally.)
-grenade-sticky bomb. Plus you can cook both to the point of using it as a kamikaze weapon
-Okay the rocket launcher is only in select game modes. It's alt fire is a homing rocket.
And if you get close enough to your oponent, one of the buttons let's you either punch or kick him.
The graphics are very simple but the options come with enough modifiers to make the game pretty. There's even a color code chart at the top that says Fast, Moderate, Slow and pretty.

The game comes with a boatload of interesting and well balanced maps. But if that isn't enough for you, or you just have a hard on for modding, the game comes with a map editor. Again, I haven't bothered with the thing because I'm more worried about shooting things in the face.

A couple of con's the game has:
-No music past the menu screen.
-Hit boxes are slightly off
-The hit confirmation noise is just a beep which is easily overlooked.
-Graphics aren't on the cutting edge. Probably won't bother most but some people love them some pretty graphics.
-I guess another con is you seem to only be able to carry 3 weapons at a time. I personally like it this way but your mileage may vary.

Some pro's of the game:
-Fast paced
-Lot's of levels
-Online/offline play. Offline plays with bots.
-Map editor
-Simple enemy identifier. If it's a different color, shoot it.
-Decent amount of guns with tactics for each.
-IT'S COMPLETELY FREE!
-The download link I provided has downloads for windows, linux, win32, mac osx.
-Completely customizable controls.

If you love fps's in a similar vein as unreal tournament, this is a fully recomended download. Give it a go and tell us what you think of it.
Now if you'll excuse me I have more things to shoot in the face.

Edit: Spelling and forgot a link.

Been shooting stuff up for awhile, myself. We did a deathmatch with jetpacks...twas most interesting flying all over the place, sniping while flying, having sword battles in the air...

the shotgun kicks so much ass. its like quake and UT.

I've grown pretty fond of the plasma pistol's alt fire. It's like a roving death vacuum.

Shotgun?! Bull****!! Flamethrower is, by far, the best and most overpowered weapon in the game.

if you kick off the wall, the flamethrower is useless.

Yeah, and the shotgun fires at a speed right above turtle

The shotgun is my favorite so far. I normally kill myself with the flamethrower.

On the plus side, jet pack+medieval+deathmatch=good times. So many headshots with swords. So many kamikaze's with grenades.
Now I need to update the OP.

Shamelessly bumping this topic thi one and only time cause I don't want this to die so soon.

But so this isn't a complete waste, players can vote on which map and mode and mutations the next round has. Just found this out.

This looks awesome, I wish I had a good PC/laptop.

It doesn't take a whole lot to run this game. I'm running it on my laptop at medium low settings just fine.

Edit: Not to mention some features can just be turned off completely if you need to.

Yeah, this game is honestly kinda weak in the graphics department. I mean, not bad at all, but still pretty meh. The gameplay shines, though.

Does anyone wanna play a game or two? I'm not gonna lie, I'm not good at all. And I'll probably be a bit laggy. But still anyone wanna give it a go?