Seems like Supabase deserves a mention, with their contributions to the Postgres ecosystem.
pg_graphql - https://supabase.com/blog/pg-graphql-v1
pg_jsonschema - https://supabase.com/blog/pg-jsonschema-a-postgres-extension...
Postgres WASM - https://supabase.com/blog/postgres-wasm
..And other open-source features.
Supabase didn't do Postgres WASM first, wasmer did FYI (3 years ago)