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

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If you’re looking for something more privacy-conscious, or if you just want to see what independent Android app developers are up to, we’ve compiled some of the best open-source calendar apps for Android right here. 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.

[Source: Android Police]