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Are there any good alternatives Heroku to host applications for free?

I used to use Heroku to host my front and back end since Heroku had things like JawsDB, but Heroku no longer offers free backend hosting

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There are a number of services which have permissive free tiers so depending on how much traffic your project gets they may or may not truly be free. Couple that occur to me are railway.app, Render, fly.io, Vercel, Cloudflare (Pages), and of course Google and AWS have free tiers but are much more complicated.

If you have a specific type of app or workload you're trying to run I may be able to suggest others.