Don't look for free (as in beer) tools; look for good tools that are free (as in speech) and fund them.

Not just free, open-source! :)

One q: why are you building a code running/functions platform inside your project, sounds very overdone and not related to your project. Also scary as a customer. I would recommend just make people host workers, we'll need it anyway to access resources, VPCs, etc.

I can understand being skeptic about that but we did not invent nsjail nor linux forks so it's pretty simple and rock solid: take source code, wrap it a little, execute it with python or deno. As soon as cloudflare workers is open-source, we will provide adapters. We did not have much alternative to make it easily self-hostable but interested to hear your suggestions.

I'm one of the founders at Airplane–we have a free plan as well up to 5 users: https://www.airplane.dev/pricing

If pricing is a problem above that, I'm happy to chat about a discounted plan or higher free limit depending on your use case! Feel free to send me a note at ravi@airplane.dev