Since this has come up 4-5 times on the thread already, the clear subtext of this post is that this developer wants to build to the S3 API, but run their storage locally --- maybe for testing reasons, maybe for data hygiene reasons, maybe for performance reasons. So things like "what about Hugging Face's object storage product" don't really answer their question.
Yeah, but that missing context is super important.
If they want it for local dev work, that's pretty different from wanting a high-performance air gapped object store without rewriting clients.
They seem to know what they're doing (having complained about a methodology problem in MinIO), and yet don't personally want to throw their hat in the ring not maybe pay anyone...
Context matters!
I wouldn’t say it’s “clear”. If you want good answers to your Internet blog begs, it’s probably good to actually state your use case. “I just want S3” means different things to different people.