Minio used to be de facto here, but they did a bait and switch recently and removed the UI from the free version. Garage is probably closest to best in class for open source on prem.

Does garage-dev have a GUI? I thought it did not.

I'm using it in my lab, along with an older instance of minio, and both are excellent choices I think. (I'm running both as HA jobs within a Hashicorp Nomad cluster, which complicates / eases various things.)

I had a vague memory of minio losing some favour a while back because they switched their underlying storage from basic object : normal file mapping to something more complex. A lot of home users, and I guess developers, liked the ability to navigate their S3-esque buckets via normal linux file system tooling.

But isn't it still available separately?

https://github.com/minio/object-browser?tab=readme-ov-file