1. Apache Cassandra. http://cassandra.apache.org. Apache Cassandra. http://cassandra.apache.org.
2. libcds: Library of lock-free and fine-grained algorithms. http://libcds.sourceforge.net. libcds: Library of lock-free and fine-grained algorithms. http://libcds.sourceforge.net.
3. Intel Thread Building Blocks: a C++ template library for task parallelism. http://www.threadingbuildingblocks.org. Intel Thread Building Blocks: a C++ template library for task parallelism. http://www.threadingbuildingblocks.org.
4. Project voldemort: A distributed key-value storage system. http://project-voldemort.com. Project voldemort: A distributed key-value storage system. http://project-voldemort.com.
5. LevelDB a fast and lightweight key/value database library by Google 2005. https://github.com/google/leveldb commit 2d0320a458d0e6a20fff46d5f80b18bfdcce7018. LevelDB a fast and lightweight key/value database library by Google 2005. https://github.com/google/leveldb commit 2d0320a458d0e6a20fff46d5f80b18bfdcce7018.