Free & Open-Source Fantastical Premium Alternatives

Premium calendar features.

1. Thunderbird Calendar ↗ FOSSPRIVATE
   Thunderbird's built-in calendar component.
   ●○○Easy · Reads common file formats
2. GNOME Calendar ↗ FOSSPRIVATE
   Linux desktop calendar app.
   ●○○Easy · Strong feature parity
3. Etar ↗ FOSSPRIVATE
   Free open-source Android calendar app.
   ●○○Easy · Strong feature parity