another wonderful option with AGPL https://github.com/aerospike/aerospike-server https://github.com/aerospike/aerospike-server and for the redis interface https

another wonderful option with AGPL https://github.com/aerospike/aerospike-server https://github.com/aerospike/aerospike-server and for the redis interface https://github.com/aerospike-community/skyhook https://github.com/aerospike-community/skyhook aerospike also has transaction support and strong session consistency