I'd like to nominate TicKV (Tiny Circular Key Value). It's a small file system allowing key value pairs to be stored in Flash Memory. It doesn't require any dependencies and works with no_std
It's designed to allow embedded Rust applications to store data in flash, while maintaining loss resilience, wear leveling and a low memory and storage overhead. It even allows the tests to be run on your host machine, so it can be developed locally, which is pretty cool!