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.
Hybrid Relational-Database/NOSQL-Datastore
created at Aug. 24, 2010, 5:32 a.m.
Aerospike Database Server – flash-optimized, in-memory, nosql database
created at March 8, 2018, 12:59 a.m.