@vgr @Bert Skype used to be decentralized. The hard part is connecting users together. ActivityPub could do this. It's something I'd love to see realized. It's third in my list.
Mastodon instance for attendees of Refactor Camp, and members of various online/offline groups that have grown out of it. Related local groups with varying levels of activity exist in the Bay Area, New York, Chicago, and Austin.
Kinda/sorta sponsored by the Ribbonfarm Blogamatic Universe.
If you already know a few people in this neck of the woods, try and pick a handle they'll recognize when you sign up. Please note that the registration confirmation email may end up in your spam folder, so check there. It should come from administrator Zach Faddis.