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memcached - High-performance, distributed memory object caching system
MongoDB - MongoDB (from "humongous") is a scalable, high-performance, open source NoSQL database.
Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
CouchDB - HTTP + JSON document database with Map Reduce views and peer-based replication
BoltDB - An embedded key/value database for Go. Contribute to boltdb/bolt development by creating an account on GitHub.
RethinkDB - The open-source database for the realtime web