Catcoin is crypto-currency, similar to Bitcoin and Litecoin. It uses Scrypt as Proof-of-work algorithm.
Some technical information about CatCoin:
Block reward: 50 CAT
Block time: 10 minutes
Retarget: 36 blocks (roughly 6 hours)
Max supply: 21 million
Reward halving interval: 210000 blocks (roughly 4 years)

Source code

Block explorer

Original thread at bitcointalk, including list of pools

CatCoin on CoinMarketCap