I dug into the Postgres sources to write my own WAL receiver

pgxcli -- A PostgreSQL CLI client written in Go.

Postgres's lateral joins allow for quite the good eDSL

PgQue: Zero-Bloat Postgres Queue

Keeping a Postgres Queue Healthy

pGenie: open-source SQL-first PostgreSQL codegen for Java

Show HN: Honker – Postgres NOTIFY/LISTEN Semantics for SQLite

Xata: Open source Postgres platform with copy-on-write branching and scale-to-zero

pg_plan_alternatives: Tracing PostgreSQL Query Plan Alternatives Using eBPF

Add CONCURRENTLY option to REPACK (PostgreSQL)