It's a set of libraries in Rust for that purpose, but as another poster just above mentions, there is a project, and according to the readme, is fully functional and implements all the BOLTs.

It's funny, I am always seeing so much noise from the Rust dev community about how great their stuff is yet rust-lightning has less press than any other implementation.

I personally am dirty on Rust due to it being sponsored by Bitcoin DID-denying Mozilla Foundation (because boiling the oceans!). As well as the fact that the only thing about the language that is any better than C++ is the build system (cargo), which basically is a copy of the Go build system with inline generators. (and sadly too many Go devs use Make to trigger these things and then get carried away with themselves ignoring all the other things the Go tooling does). Actually, I'm pretty dirty on most Go based projects too, in the Bitcoin ecosystem, seems to me like none of them really love Go that much, building and writing like C++ programmers. Cosmos ecosystem pissed me off too, because they write Go like Java programmers.

Gah, doesn't anyone read the f...king vast repository of great advice on how to build Go stuff other than hardcore gophers like me???

edit: no, rust-lightning is not a server implementation, for that look for Sensei https://l2.technology/sensei

AFAIU, LDK’s main target audience are wallet providers that want to add lightning functionality to their existing wallet software. In that situation, LDK handles all interactions with the Lightning Network, but the wallet developers need to bring-their-own-blockchain (e.g. Bitcoin Core) and need to handle their on-chain transactions themselves.

If you just want to run a Lightning Node, I don’t think that LDK by itself is what you are looking for.