[frozenwind]

This thread is interesting, I'll be looking for other suggestions in the comments. I'm currently using the free option of remote.it to connect to a raspberry pi behind a router, though I always have to go through the step of obtaining the connection url and random port before using something like putty.

[perakojotgenije]

https://sshreach.me (disclaimer: I am the author)

[cerberusss]

Remote.it looks pretty interesting. They have a desktop app for macOS in beta, as well.