Baïkal - Cal and CardDAV server
MUTE - Crowdsourced words list to mute on social media
Radicale - The Radicale Project is a complete CalDAV (calendar) and CardDAV (contact) server solution.
News Feed Snooze - Hide a person, Page or group for 30 days on Facebook
DAViCal - DAViCal is a server for calendar sharing.
Mute Filters by Feedly - Block distracting memes, amplify news that matters