Sauerbraten (aka Cube 2)

WTF IS IT?!
An fps/rpg maker, UNIQUE in every way.

aww what the hell, im no good at presenting jack shit.

Cube 2 is the best FPS Maker there is. It can make RPG games too! the rpg part is under cunstruction (does it matter? it can make basic rpgs and has the best graphics to offer and its free!)

Link to website:
http://sauerbraten.org/

It might be bending the rules a bit by posting this, but its too good not to post!
Features:

• awesome graphics
  fast paced
  100% free
  UNIQUE editing (more below)
  can make multiplayer RPG games
  very quick to switch from editing to playing! (it doesnt even take 1/100000 of a second)
  its not restricted to pre-made recourses
  doesnt crash or block you from servers where u dont have a certain texture for that map
  advanced hill making
  advanced cliff building
  anything else you want

how is it unique?
start the game(maker)
hit 'E'
Bang! ur in edit mode!
hit 'E' again.
Bang! ur playing the game again!
its literally takes 0.000000000000000003 seconds to switch modes!

And it has a rediculously high fps rate! (usually about 100+)
you can easily trade the rediculously high fps rate for visual/sound quality and vice versa.
on a 56kb/p connection my ping was consistantly under 50! (NO LAG!)

advanced shadowing
reflective textures that react to lights.

ok stuff this, words can't explain it. see for yourself. id post screenies but... there are already hundreds at http://sauerbraten.org/

One more thing: Enjoy it or ur nuts and u belong in a psycho ward!

Note: this needs a 256 MB Video card, be prepared. :x

Note: This absolutely flies on my Ti4200 with 128 MB.

Note: This absolutely flies on my Ti4200 with 128 MB.

=O My last 128 MB ran so badly with it :<

Which card do you have?

. imo source is the best fps maker but this one is great for maps
full 3d realtime editing

This program's pretty decent, but I had to mess with it at a friend's house. On my crap computer, it ran at about 1-3 fps.

My computer runs it at about 190 fps.

I don't have a clue how to use the edit stuff.

double post for great win.

How do I go to edit mode?

Press "e" on your keyboard, I think.

This is one of the easiest editors to use and its rediculously powerful. i got a CRAP windows xp and its around 60 fps, just tune down the graphics a little if its slow. btw:
KEYS!:
e = edit mode
left mouse in editmode = select faces to work with, drag to select many
middle mouse = corner editing
mouse wheel = extrude/sink the cubes/corners
space = deselect if in edit mode, otherwise its jump
1-6 = weapon select
~ = console
t = talk, YES its online!
F1 = pause (only in single player)
ok there are your basics... Its by far the greatest fps maker (in some ways)

Is it a game or a maker?
I seriously don't get it. 

its an engine. Developers save time when making future games by starting with a grounds to build from.

Eg. Half Life 2 uses the source engine so does Team fortress 2, Half life 3(the 3 episodes), counterstrike,left 4 dead(new game)

Cube is an engine that allows you to make a fps aswell as the developers as its open source.