Fossify Calendarโ โ โ โ โBasic calendar app that works with your phoneโs local calendars. You can do all the usual things you want to use a calendar for on your phone. Doesnโt clutter up your schedule with ads or vacuum up your personal data.
Microsoft Outlook (Android)โ โ โ โ โIt works. More stable than the desktop version. Handles mail, calendar and contacts, offers the focused/other inbox view. Tries to keep you in Microsoftโs apps. OK for work, wouldnโt use it for personal mail.
Microsoft Outlook (Desktop)โ โ โ โโI wonโt say Iโve never liked Outlook, because the macOS version has been pretty decent for a while now (if a bit of a resource hog), but the Windows versions have always been awkward, cluttered, and quirky.
Nextcloud Calendarโ โ โ โ โ Self-hosted, web-based calendar that syncs easily with other apps and has completely replaced Google Calendar for me.
Thunderbird (Email and Calendar)โ โ โ โ โ 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)โ โ โ โ โ Spiritual successor to the original Opera browser, this ultra-customizable web browser can open into a full suite for email, calendar, feeds and more โ but only if you want it to.