Karlender
GTK calendar application
early
available in 8 distros
Alpine 3.17
Alpine 3.18
Alpine edge
AUR
Flathub
Nix stable 22.11
Nix stable 23.05
Nix unstable
Planify
Never worry about forgetting things again
mature
available in 5 distros
AUR
Flathub
Nix stable 22.11
Nix stable 23.05
Nix unstable
Reminders
Set reminders and manage tasks
mature
Flathub
CalDAV
Microsoft To Do
productivity
GTK4
libadwaita
5