garaged:
    image: dxflrs/garage:v2.2.0
    ports:
      - "3900:3900"
      - "3901:3901"
      - "3902:3902"
      - "3903:3903"
    volumes:
      - /opt/garage/garage.toml:/etc/garage.toml:ro
      - /opt/garage/meta:/var/lib/garage/meta
      - /opt/garage/data:/var/lib/garage/data

I didn't find an alternative that I liked as much as MinIO and I, unfortunately, ended up creating a my own. It includes just the most basic features and cannot be compared to the larger projects, but is simple and it is efficient.

https://github.com/espebra/stupid-simple-s3

Go for Garage, you can check the docker-compose and the "setup" crate of this project https://github.com/beep-industries/content. There are a few tricks to make it work locally so it generates an API key and bucket declaratively but in the end it does the job

S3 Ninja if you really just need something local to try your code with.

versitygw is the simplest "just expose some S3-compatible API on top of some local folder"

OS's file system? Implementation cost has been significantly decreased these day. We can just prompt 'use S3 instead of local file system' if we need to use a S3 like service.

RustFS is dead simple to setup.

seaweedfs: `weed server -s3` is enough to spin up a server locally