We had used this one
https://bitcointalk.org/index.php?topic=379601.0Primecoin (XPM)
https://bitcointalk.org/index.php?topic=251850.0http://primecoin.orgExchanges - BTC-e, Cryptsy, Vircurex, Bter
Frozen (FZ) - Based on Quark.
https://bitcointalk.org/index.php?topic=411291.0http://www.fzcoin.cc/Exchanges - CoinedUp
Datacoin (DTC) - Based on Primecoin
https://bitcointalk.org/index.php?topic=358592.0http://datacoin.infoExchanges - Bter, coins-e
MemoryCoin 2.0 (MMC) - GPU miner available but CPU miner works better.
https://bitcointalk.org/index.php?topic=370806.0http://www.memorycoin.org/Exchanges - Bter
QubitCoin (Q2C - previously QBT) - Very new
https://bitcointalk.org/index.php?topic=411065.0Q2C does not have its own website.
Exchanges - None
BernanKoin (BEK)
https://bitcointalk.org/index.php?topic=375010.0BEK does not have its own website.
Exchanges - None
Limited GPU Mining
These coins can be GPU mined with some difficulty. The GPU miner is not mature and requires lots of tweaking.
Quark (QRK) - Based on Sifcoin. GPU mineable with smelter.
https://bitcointalk.org/index.php?topic=260031.0http://www.qrk.cc/Exchanges - Cryptsy, Vircurex, Bter
Protoshares (PTS) - GPU mineable with cudaminer update.
https://bitcointalk.org/index.php?topic=325261.0http://invictus-innovations.com/protosharesExchanges - Cryptsy, Bter
Particle (PRT) - Based on Quark. GPU mineable with smelter.
https://bitcointalk.org/index.php?topic=392804.0http://www.getparticles.comExchanges - CoinedUp
SecureCoin (SRC) - Based on Quark. GPU mineable with smelter.
https://bitcointalk.org/index.php?topic=270852.0http://Securecoin.orgExchanges - Cryptsy, Bter
Your Alternative Currency (YAC) - GPU mineable with modified cgminer.
https://bitcointalk.org/index.php?topic=206577.0http://yacoin.org/Exchanges - Bter
Vertcoin (VTC) - GPU mineable with custom cgminer.
https://bitcointalk.org/index.php?topic=404364.0http://vertcoin.orgExchanges - None
Molecule (MOL) - Based on Quark. GPU mineable with smelter.
https://bitcointalk.org/index.php?topic=371576.0http://www.moleculecoin.com/Exchanges - None
Unioncoin (UNC) - Based on Quark. GPU mineable with smelter.
https://bitcointalk.org/index.php?topic=365399.0https://www.unioncoin.orgExchanges - None
Offerings to Cthulhu (OFF) - Based on Quark. GPU mineable with smelter.
https://bitcointalk.org/index.php?topic=294383.0http://[Suspicious link removed]/
Exchanges - None
Atom (ATO) - Based on Quark. GPU mineable with smelter.
https://bitcointalk.org/index.php?topic=380546.0http://www.atocoin.comExchanges - None
High Risk CPU-Only AltCoins
Proceed with caution if you want to use these.
Ducats (DUC) - GPU mineable with smelter.
https://bitcointalk.org/index.php?topic=421110.02CHcoin (2CH) - Russian coin. GPU mineable with smelter.
https://bitcointalk.org/index.php?topic=401296.0Advertisingcoin (ATC) - China coin?
https://bitcointalk.org/index.php?topic=421080.0Zurcoin (ZUR) - Altcoin is for fun only. Good for learning.
https://bitcointalk.org/index.php?topic=391806.0Siriuscoin (SSC) - Dead at birth.
https://bitcointalk.org/index.php?topic=375010.0The Bull Coin (TBC) - New but stalled. Dev doesn't have a plan.
https://bitcointalk.org/index.php?topic=409903.0Secondscoin (SEC) - Dev has disappeared and deleted source.
https://bitcointalk.org/index.php?topic=381587.0CDNCoin (CDN) - Half the posts in thread say to beware.
https://bitcointalk.org/index.php?topic=393190.0RVDCoin (RVD) - Launched by user account opened same day
https://bitcointalk.org/index.php?topic=357196.0Dimecoin (DIME) - 8% premined
https://bitcointalk.org/index.php?topic=382164.0