A public libevent repository. The official repository is at https://github.com/libevent/libevent

LevelDB is a fast key-value storage library written at Google that provides an ordered mapping from string keys to string values.

Free and Open, Distributed, RESTful Search Engine

Time Series data structure for Redis

Redis is an in-memory database that persists on disk. The data model is key-value, but many different kind of values are supported: Strings, Lists, Sets, Sorted Sets, Hashes, HyperLogLogs, Bitmaps.

带有详细注释的 Redis 3.0 代码（annotated Redis 3.0 source code）。