FLO is a scrypt based coin with quick transaction processing that introduces a useful new feature called 'transaction comments'. These transaction comments enable FLO to facilitate a number of unique applications and enhancements within the blockchain.
ARPA is a Secure Computation Network Compatible With Blockchains They propose a blockchain-based secure computation network of Multi-party Computation (MPC). ARPA cryptographically enables private smart contract, unprecedented data-at-use privacy protection, as well as scalable computational sharding.