I'm thinking maybe SeaweedFS [0, 2] or Versity Gatweway [1, 3] or RustFS [4].
Seems there are other options, too, e.g. Garage [5].
I only used MinIO briefly in the past, but it was good/worked, and I do plan to set up S3 blob storage again soon.
[0] https://github.com/seaweedfs/seaweedfs
[1] https://github.com/versity/versitygw
[2] https://blog.elest.io/rustfs-vs-seaweedfs-vs-garage-which-mi...
[3] https://news.ycombinator.com/item?id=47806348
Thanks a bunch! Currently I'm weighing SeaweedFS vs RustFS, and if I just wanted S3-compatible API, I'd probably go with RustFS although it's not so mature yet, but with WebDAV and some other stuff, and favoring stability and reliability, looks like I'm leaning more towards SeaweedFS.