Free & Open-Source Fantastical Alternatives

Premium calendar app for Apple devices.

1. Thunderbird Calendar ↗ ★ PICKFOSSPRIVATE
   Thunderbird's built-in calendar component.
   ●○○Easy · Reads common file formats
2. GNOME Calendar ↗ FOSSPRIVATE
   Linux desktop calendar app.
   ●○○Easy · Strong feature parity