Fosscord is still a work in progress. If you're an advanced user see here for a guide on how to get started.
Community Instances:
fosscord.com
The offical Fosscord instance
Stilic on Fosscord
The official instance of Stilic BanTheNons
Instance of BanTheNons FuflyPaladium
Instance of FuflyPaladium
Chris Chrome's Fosscord
Instance of Chris Chrome
TheArcaneBrony
Instance of TheArcaneBrony
Rednd's Fosscord Instance
An Official Instance of Rednd DairyWeb3638077's Fosscord
Instance of DairyWeb3638077