http://tarantool.org and https://github.com/tarantool/tarantool
In "mail.ru" we wrote and widely use Tarantool key-value database.
It's key properties include:

* Defferent index types with iterators:
    - HASH (the fastest)
    - TREE (range and ordered retreival)
    - BITSET (bit mask search)
    - RTREE (geo search)
* multipart keys for HASH and TREE indexes
* Data persistence with by Write Ahead Log (WAL) and snapshots.
* asynchronous master-master replication, hot standby.
* coroutines and async. IO are used to implement high-performance lock-free access to data.
    - socket-io/file-io with yeilds from lua
* stored procedures in Lua (Using LuaJIT)
* supports plugins written on C/C++ (Have two basic plugins for working with MySQL and PostgreSQL)
* Authentication and access control

Move 'distribution target' to the end (it's needed for .jar to be in the .tar.gz)