SOGo - SOGo is groupware server with a focus on scalability and open standards.
Trump Filter - Chrome extension that removes Donald Trump from the internet
Baïkal - Cal and CardDAV server
News Feed Snooze - Hide a person, Page or group for 30 days on Facebook
Xandikos - Lightweight CalDAV/CardDAV server on top of Git.
Mute Filters by Feedly - Block distracting memes, amplify news that matters