http://www.twitch.tv/tastyspleentv/c/5813093
What client they are using?

Heyo!

That's actually just ezQuake. The "celshading" (it isn't really, just doubling the model, scaling up a bit, inverting the normals, and coloring it black) is accomplished via the gl_outline command. I think there's gl_outlinewidth or something similar, tab-complete to verify that. I'm not a huge fan of it for gameplay, but for streams it helps create that world/entity visual separation.

Aha) Thanks man!
gl_outline some help. But how make that WHOLE map has been celshaded and flat semiflattextures?

No way to make the whole map cel shaded, for flat textures either use a big gl_picmip, or just r_draxflat and tweak r_floorcolor & r_wallcolor .

Thanks!
And how make skins and GUI like in video?

or gl_textureless 1