One option is Teleport–I haven’t used it much (yet) but I think lots of people use it for distributing clocks to different places.
V1 only in the library for now, but I believe it’s in beta for V2 and should hit the library soon. Here is the V2 branch if you’re able to build plugins, and there may be a binary available (didn’t see one on github, but I didn’t look very hard).
Lots of details and some sample clock setups in this thread (and a cool detail about how it works between VSTs):