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.
AERGO is an open platform that allows businesses to build innovative applications and services by sharing data on a trustless and distributed IT ecosystem. With the ability to deploy on either public or private blockchain networks, AERGO gives businesses the flexibility in developing and deploying blockchain applications with unparalleled speed, scalability and performance. AERGO is designed as a flexible, plugin-based smart contract infrastructure. Client-actors can execute smart contracts written for the Ethereum Virtual Machine or AergoSQL. The AERGO network will be backboned by github-like public and permissioned repositories of Distributed Directories (DD). Implementing Smart Oracles, AERGO will also allow smart contracts to consume data with external services or internal databases and trigger events.