Infinitecoin is a Litecoin fork and uses the scrypt Proof-of-Work hashing algorithm. It has a 30-second block target and the difficulty retargets every hour. There is a total of 90.6 billion Infinitecoin. Block rewards are 524,288 Infinitecoin per block and halves every 86,400 blocks (roughly 1 month). Infinitecoin was launched on 5 June 2013.
Novacoin is a hybrid Proof of work (POW) / Proof of stake (POS) decentralized peer-to-peer cryptocurrency.The Proof of Work part of Novacoin is based on the Scrypt hashing algorithm. Proof of Stake contributes to the coins energy efficiency, as there is no need for nodes to contribute mining power to part of the money creation process. As of now, Novacoin is set to be capped at 2 billion coins. However Novacoin stated that the cap limit may be lifted if the situation requires it. It looks very much like a variation of Sunny King Peercoin.