A Google search of “mac share clipboard” turned up quite a bit.
The problem with most of those is that they only work with text/images. I’m assuming that to be able to work with app-specific data, they would have to operate at the binary level.
For example, let’s say I built a custom Backdraft module for one of my customers. It would be very handy if I could copy the entire module to my clipboard then share that with the customer for them to paste into Backdraft. This would circumnavigate the whole “transfer Freeway file, copy and paste module into your copy of Backdraft” thing.