Columnar storage extension for Postgres built as a foreign data wrapper. Check out https://github.com/citusdata/citus for a modernized columnar storage implementation built as a table access method.
created at April 3, 2014, 11:24 a.m.
MySQL fork maintained and used at Twitter
created at Jan. 3, 2012, 11:04 p.m.
Free and Open Source, Distributed, RESTful Search Engine
created at Feb. 8, 2010, 1:20 p.m.
Aerospike Database Server – flash-optimized, in-memory, nosql database
created at March 8, 2018, 12:59 a.m.
BlinkDB: Sub-Second Approximate Queries on Very Large Data.
created at Oct. 7, 2011, 12:24 a.m.
Percona TokuDB is a high-performance, write optimized, compressing, transactional storage engine for Percona Server. Issue tracker: https://tokutek.atlassian.net/browse/DB/ Wiki: https://github.com/Percona/tokudb-engine/wiki Downloads:
created at April 17, 2013, 10:43 p.m.
Hybrid Relational-Database/NOSQL-Datastore
created at Aug. 24, 2010, 5:32 a.m.