Bytecoin is GPU mineable on both ATI and AMD.  Claymore ATI Miner is closed-source and gives mandatory 5% to developer. Tsiv’s ATI Miner is open-source.

Technical Information
Release Date: 2012/07/04
Algorithm: CryptoNight
Total supply: ~184,460,000,000
Premine: 0
Block Time: 2 minutes
Block Reward: (2^64 – 1 – A) / 2^(18), where A = supply mined to date
Difficulty Retarget: Every Block

Websites
Website
Bitcointalk
Cryptocointalk
Reddit

Block Explorer
Source
IRC: #bytecoin-dev