Looked cool, here is the moddb page with DL's. Hope it don't suck!

http://www.moddb.com/games/alien-arena-2008

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"I hope Draken and #'s will get picked up by communities that actually deserve them."

Looks like UT3.

Engine
Custom Built

So it says...

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"I hope Draken and #'s will get picked up by communities that actually deserve them."

Alien Arena is a standalone game based off of the id Tech2 source that combines a sci-fi atmosphere with the tournament style deathmatch of Q3A and UT2k4. With major graphical enhancements such as per-pixel lighting, hi-res textures, light blooms, real time lights and shadows, textured particles, shaders, and reflective water, Alien Arena brings the Quake II engine into modern gaming.

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Well the description, says it's a custom built engine, so they are liars.

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"I hope Draken and #'s will get picked up by communities that actually deserve them."

Alien Arena is oooooold.

Also, Alien Arena is the only game that uses the CRX engine, it's just based off of idTech2.

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God.