There is also Procrastinate: https://procrastinate.readthedocs.io/en/stable/index.html

Procrastinate also uses PostgreSQL's LISTEN/NOTIFY (but can optionally be turned off and use polling). It also supports many features (and more are planned), like sync and async jobs (it uses asyncio under the hood), periodic tasks, retries, task locks, priorities, job cancellation/aborting, Django integration (optional).

DISCLAIMER: I am a co-maintainer of Procrastinate.