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The best free and open-source alternatives to Google Calendar on Android

Get organized outside the Google bubble

Simple Calendar
When I asked social media for open-source alternatives to Google apps, the Simple Mobile Tools series of applications was brought up by many. Primarily developed by Slovakian-based Tibor Kaputa, Simple Mobile Tools is a suite of productivity apps that mirrors the ecosystems you get from the likes of Google, Microsoft, and Apple.

Etar
Another excellent open-source option is Etar, developed by Jochen Sprickerhof and Suhail Alkowaileet and based on the AOSP Calendar app. It’s lighter on features than Simple Calendar, but still has month/week/day/agenda views, both light and dark themes, notification support, no advertising, and a nice design …