DAVxβ΅β β β β β Background app that syncs your non-Google cloud accounts with your Android system calendars and contacts.
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.
Fluent Readerβ β β ββA simple, no-nonsense, modern-looking RSS/Atom newsfeed reader for Windows, Mac and Linux. Optionally sync with multiple services, but Iβve had issues with Nextcloud.
Fossify Calendarβ β β β βBasic calendar app that works with your phoneβs local calendars. You can do all the usual things you want to use a calendar for on your phone. Doesnβt clutter up your schedule with ads or vacuum up your personal data.
Fossify Contactsβ β β β βBasic, privacy-respecting contacts app for Android that works with all contacts accounts on your phone.
NewsFlashβ β β β β Clean, stable, fast, free, no-clutter and no-nonsense RSS/Atom newsfeed reader for Linux that optionally syncs with multiple services.
Nextcloud Calendarβ β β β β Self-hosted, web-based calendar that syncs easily with other apps and has completely replaced Google Calendar for me.
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.
OpenTasksβ β β β β Simple to-do list that works great with a Nextcloud server or local storage on your phone.
RSS Guardβ β β β βA solid cross-platform feed reader that runs on Windows, Mac and Linux. Extremely capable and customizable. Syncs with multiple services.
Thunderbird (Email and Calendar)β β β β β Stable, capable desktop email application, works well with multiple accounts including Gmail, Nextcloud, easy to set up and use but with advanced settings when you need them. FLOSS.