Smithay Clipboard
This crate provides access to the Wayland clipboard for applications already using some sort of GUI toolkit or a windowing library, like winit, since you should have some surface around to receive keyboard/pointer events.
If you want to access clipboard from the CLI or to write clipboard manager, this is not what you're looking for.
Documentation
The documentation for the master branch is available online.
The documentation for the releases can be found on docs.rs.