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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.
Hypothetical Indexes for PostgreSQL
A lightweight replication manager for PostgreSQL (Postgres)
AgensGraph, a high performance transactional graph database based on PostgreSQL
C library for accessing the PostgreSQL parser outside of the server environment
:snowboarder: EJDB2 — Embeddable JSON Database engine C library. Simple XPath like query language (JQL).
One advanced and mature open-source MPP (Massively Parallel Processing) database. Open source alternative to Greenplum Database.
Postgres extension and service for automated failover and high-availability
Aerospike Database Server – flash-optimized, in-memory, nosql database
Lightning-fast file system indexer and search tool
pmacct is a small set of multi-purpose passive network monitoring tools [NetFlow IPFIX sFlow libpcap BGP BMP RPKI IGP Streaming Telemetry].
Logical Replication extension for PostgreSQL 17, 16, 15, 14, 13, 12, 11, 10, 9.6, 9.5, 9.4 (Postgres), providing much faster replication than Slony, Bucardo or Londiste, as well as cross-version upgrades.
Official HDF5® Library Repository
The Official MongoDB driver for C language
A PostgreSQL client library for Ruby
Trilogy is a client library for MySQL-compatible database servers, designed for performance, flexibility, and ease of embedding.
plpgsql_check is a linter tool (does source code static analyze) for the PostgreSQL language plpgsql (the native language for PostgreSQL store procedures).
Logical multi-master PostgreSQL replication
A PostgreSQL extension for automatic bloat cleanup
Implement one small API on SQLite in any language; we benchmark it on a $12 server (1 vCPU, 2 GB)
GO DRiver for ORacle DB
ZSON is a PostgreSQL extension for transparent JSONB compression
Adaptive query optimization for PostgreSQL
zsv+lib: tabular data swiss-army knife CLI + world's fastest (simd) CSV parser