Published an article about alternatives on medium.
https://medium.com/p/a0b378528fd1

This is a simple version of that.

Fly.io https://fly.io/
render https://render.com/
Railway https://railway.app/
Nopeus https://nopeus.co/
pythonanywhere www.pythonanywhere.com
APPLIKU https://appliku.com/
Adaptable https://adaptable.io/
Qoddi https://qoddi.com/
Deta Cloud https://www.deta.sh/
Glitch https://glitch.com/
replit https://replit.com/
Engine Yard https://www.engineyard.com/
OCI Cloud https://www.oracle.com/cloud/free/

self-host

Coolify https://coolify.io/
Capover https://caprover.com/
dokku https://dokku.com/
piku https://github.com/piku/piku
kubero https://github.com/kubero-dev/kubero