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.
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.
Fossify Galleryβ β β β βBasic on-device gallery that lets you manage your photos without sending them to a cloud service just to deal with whatβs on your phone.
Fossify Keyboardβ β β ββI wanted to like this keyboard, but I canβt seem to type reliably with it just by tapping on my phone, and thereβs no swipe gesture or autosuggest support. It works better at tablet size.
Gearyβ β β β βReally lightweight but still modern, so itβs a good choice on lower-end hardware. Basic IMAP features, good for most day-to-day email use.
K-9 Emailβ β β β βClassic email app for Android: No frills, no ads, no tracking. Supports multiple accounts, phone-to-tablet layouts, and dark mode.
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 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.
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.