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.
Microsoft Outlook (Android)β β β β βIt works. More stable than the desktop version. Handles mail, calendar and contacts, offers the focused/other inbox view. Tries to keep you in Microsoftβs apps. OK for work, wouldnβt use it for personal mail.
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.
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.
Vivaldi (Web Browser)β β β β β Spiritual successor to the original Opera browser, this ultra-customizable web browser can open into a full suite for email, calendar, feeds and more β but only if you want it to.