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.
Trump Filter - Chrome extension that removes Donald Trump from the internet
DAViCal - DAViCal is a server for calendar sharing.
Mute Filters by Feedly - Block distracting memes, amplify news that matters