I have been playing around with building an Iroh Tunnel Sandstorm app that can connect two Sandstorm instances, and share some capabilities exposed from one Sandstorm instance to the other, as if the capabilities were local. Iroh has been very reliable throughout the process.

By far not a complete list but a starting point https://github.com/n0-computer/awesome-iroh/

Also you can join our discord and there's #showcase https://iroh.computer/discord

See https://www.iroh.computer and "use cases" at the top of the page