add tilde-like communities

[severak]

trafficstars

hi, there is sort of online communities based on public access unix

They are typically accesed by SSH, so it's definitely belong here, probably to section on it's own.

• list of tilde servers
• history of tilde.club
• History and Future of Public Access Unix Systems

[chubin]

Yes, this is very important and very interesting. I think we should definitely add them. Do we have some good "entry" server for that? (not web)

[severak]

there is a catch - typically you need to sing up via web interface (see last column in list of tilde servers)