DAVxβ΅β β β β β Background app that syncs your non-Google cloud accounts with your Android system calendars and contacts.
Feedlyβ β β ββCloud-based feed reader with all the bells and whistles, focusing too much on the bells and whistles.
Floccus Bookmarks Syncβ β β β β Very flexible, syncs across many different desktop browsers and mobile devices, and for privacy it can run on your own server or encrypted on another cloud service.
Nextcloud Newsβ β β β β Simple web-based news reader for Nextcloud, easy to install and syncs with multiple desktop and mobile clients.
Nextcloud Notesβ β β β β Simpler than Google Keep, more private, with human-readable data that syncs quickly and cleanly with your devices.
Wayback Machine Browser Extensionβ β β β βUseful for when you want to make sure the pages youβre reading will still be around in some form in the future, and to easily get at additional context. Checks every page you view against the Wayback Machine, so turn it off when youβre not using it.
Xmarks (Discontinued)β β β β βXmarks was a cross-browser bookmark sync service that I used for a long time to keep Chrome, Firefox, IE, and Safari on multiple computers using the same set of bookmarks. It shut down in 2018.