Anyone know of an accommodations exchange that involves Networking services or teaching networking?

I like the idea of doing some sort of volunteer work, but would love to find something that in my realm of expertise (i.e., networking related, or teaching networking).

Essentially, does anyone know a service like any of these that focus on Networking / Cisco / Juniper, etc? Or even just tech work in general?

• https://www.workaway.info/
• https://www.volunteerhq.org/
• https://www.helpx.net/