Gregory's Server
I'm working on a Rust library for building ActivityPub apps:
https://codeberg.org/silverpill/mitra/src/branch/main/apx_sdk
This code was originally a part of Mitra, but over time I moved re-usable functions into independent packages and then started using them in other projects, Activity Connect and fep-ae97-client. Compared to activitypub-federation-rust, it is a low-level library with fewer dependencies, suitable for both servers and clients. The key feature is support for nomadic identity.
Currently there's no documentation and API is not well designed, but I will be improving it. The license is AGPL-3.0