Mastodon - Mastodon is a decentralized, open source social network. This is just one part of the network, run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome!
UI Garage - Specific mobile and web design patterns for your inspiration
Gab - Gab is an ad-free social network dedicated to free speech.
Muzli - UI/UX and Design Inspiration Chrome Extension
Diaspora - The online social world where you are in control.
Design Hunt - Curated design inspiration for everyone