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 * [RecDB](http://www-users.cs.umn.edu/~sarwat/RecDB/) - Open Source Recommendation Engine Built Entirely Inside PostgreSQL.
 * [Stado](http://www.stormdb.com/community/stado) - open source MPP database system solely targeted at data warehousing and data mart applications.
 * [Yahoo Everest](https://www.scribd.com/doc/3159239/70-Everest-PGCon-RT) - multi-peta-byte database / MPP derived by PostgreSQL.
+* [TimescaleDB](http://www.timescale.com/) - An open-source time-series database optimized for fast ingest and complex queries
+* [PipelineDB](https://www.pipelinedb.com/) - The Streaming SQL Database. An open-source relational database that runs SQL queries continuously on streams, incrementally storing results in tables
 
 ## Memcached forks and evolutions