Voldemort is a distributed key-value storage system. Data is automatically replicated over multiple servers. Data is automatically partitioned so each server contains only a subset of the total data. 
Server failure is handled transparently. It is used at LinkedIn for certain high-scalability storage problems where simple functional partitioning is not sufficient.

Project-voldemort - A distributed database, Clone of Amazon's Dynamo

kumofs is a scalable and highly available distributed key-value store. 
Data is replicated over multiple servers. 
Data is partitioned over multiple servers. 
Extreme single node performance; comparable with memcached. 
Both read and write performance got improved as servers added. 
Servers can be added without stopping the system. 
Servers can be added without changing the client applications. 
The system does not stop even if one or two servers crashed. 
The system does not stop to recover crashed servers. 
Scalable from 2 to 60 servers. (more than 60 servers has not be tested yet) 
Optimized for storing a large amount of small data. 
memcached protocol support. (get, set and delete only; expiration time and flags must be 0)

kumofs is a scalable and highly available distributed key-value store.

Kumofs

The Apache Accumulo sorted, distributed key/value store is a robust, scalable, high performance data storage and retrieval system. Apache Accumulo is based on Google's BigTable design and is built on top of Apache Hadoop, Zookeeper, and Thrift. Apache Accumulo features a few novel improvements on the BigTable design in the form of cell-based access control and a server-side programming mechanism that can modify key/value pairs at various points in the data management process.

Apache Accumulo - Key Value Store based on Google BigTable

Apache Geode  is distributed, in-memory database for scale-out applications. All data is stored in-memory for low latency. Performance scales linearly as nodes are added. Data is distributed automatically between nodes to optimize performance. Clusters fail-over to other nodes in case of failures, and rebalance remaining resources. Geode servers can be configured to talk memcached protocol. 

Apache Geode - Distributed, In-memory Database for Scale-Out Applications

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Project-voldemort - A distributed database, Clone of Amazon's Dynamo

Kumofs

Apache Accumulo - Key Value Store based on Google BigTable

Apache Geode - Distributed, In-memory Database for Scale-Out Applications

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Project-voldemort - A distributed database, Clone of Amazon's Dynamo

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Apache Accumulo - Key Value Store based on Google BigTable

Apache Geode - Distributed, In-memory Database for Scale-Out Applications

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