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Best Thunderbird Lightning Alternatives ranked by AI · updated May 2025
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An extension for Mozilla Thunderbird that adds calendar functionality.
Price: Free
Top 6 Thunderbird Lightning alternatives
VueMinder is a full-featured calendar and reminder program for Windows.
GNOME Calendar is a simple and intuitive calendar application for GNOME desktop environment.
Microsoft Outlook Calendar is a calendar tool integrated with the Outlook email and productivity suite. It allows users to schedule appointments, meetings,...
Included in Microsoft 365 subscription
Outlook CalDav Synchronizer is a free Outlook plugin that synchronizes events, tasks, and contacts between Outlook and CalDAV/CardDAV servers.
Google Calendar is a time-management and scheduling calendar service developed by Google. It allows users to create and edit events, set reminders,...
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