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.
Sphere (SPHR) is a decentralized peer-to-peerpayment network, secured through a proof of stake (pos) consensus blockchain. (sphere) is designed to act as an efficient and secure means of commerce, while also serving as an appreciating token for traders and long-term holders.