EU EUROPE
Replaces
Google Calendar
Microsoft Outlook
An encrypted calendar inside the Tuta mailbox
Open source
Category
Browse Calendar
Every ALT-TECH entry in this category.
EU EUROPE
Replaces
Gmail
Microsoft Outlook
Belgian mail with proper OpenPGP key management
Proprietary
Free EU EUROPE
Replaces
Gmail
Microsoft Outlook
KDE's integrated mail, calendar and contacts
Open source
Free
Replaces
Microsoft Outlook
A full groupware client for the GNOME desktop
Open source
Replaces
Gmail
Google Calendar
Microsoft Outlook
A long-established independent mail and calendar host
Proprietary
EUROPE
Replaces
Google Calendar
Google Contacts
iCloud
End-to-end encrypted calendar and contact sync
Open source
EUROPE
Replaces
1Password
Gmail
Google Workspace
Privacy, end to end
Open source
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