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I'm using Railway (for both personal and client): https://railway.app/ It's a PaaS similar to Heroku, so it can be a bit limiting in some cases, but I found it really great for most of my use-cases.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Honourable mention is fly.io which I've heard good things about (and has a free tier) but I haven't personally used it.
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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.