If you're using PostgreSQL, then

django-postgres-queue: https://github.com/gavinwahl/django-postgres-queue

procrastinate: https://github.com/procrastinate-org/procrastinate/

We use RQ[0], it has Redis as a dependency. It’s pretty straightforward and we’re very happy with it. If you are using Django you may want to look at Django RQ[1] as well. RQ has built in scheduling capabilities these days, but historically it did not so we used (and still use) RQ Scheduler[2] which I think still has some advantages over the built in stuff.

[0] https://python-rq.org/ [1] https://github.com/rq/django-rq [2] https://github.com/rq/rq-scheduler

Yes, dramatiq is quite good, but I ditched it for something even more lightweight -- pubsub subscribers via push notification so workers are web workers responding to http requests that might take up to 10 minutes