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Not sure about free but you can do something like Dokku with DigitalOcean (referral link). It's basically self-hosted Heroku for $5 a month. You can have tons of apps on there too.
Check out Render! Here are docs for Celery, and details on free plans. I'm the Developer Community Manager and if you have specific questions, I'm glad to get you pointed in the right direction...and just in case you're curious, we do have an in-depth comparison doc.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.