Software
We've compiled a list of 57 free and paid alternatives to Lightning Calendar. The primary competitors include Google Calendar, Apple Calendar. In addition to these, users also draw comparisons between Lightning Calendar and Rainlendar, EssentialPIM, Fantastical. Also you can look at other similar options here: Office and Productivity Software.
We've compiled a list of 57 free and paid alternatives to Lightning Calendar. The primary competitors include Google Calendar, Apple Calendar. In addition to these, users also draw comparisons between Lightning Calendar and Rainlendar, EssentialPIM, Fantastical. Also you can look at other similar options here: Office and Productivity Software.
With Google Calendar, its easy to keep track of all your lifes important events in one place.
Rainlendar is a feature rich calendar application that is easy to use and doesn't take much...
Fantastical is a flexible calendar with natural language event creation, a beautiful calendar and...
GMinder is a reminder program that waits in your system tray and alerts you when you have an...
An online calendar application that includes a shared calendar, website plugins, room &...
Organize your schedule and events in a calendar fully integrated with Thunderbird or Seamonkey...
Organize your schedule and events in a calendar fully integrated with Thunderbird or Seamonkey...
Windows
Linux
Mac
Organize your schedule and life’s important events in a calendar that’s fully integrated with your Thunderbird or Seamonkey email. Manage multiple calendars, create your daily to do list, invite friends to events, and subscribe to public calendars.
Lightning brings the 
Sunbird (Sunbird is discontinued) calendar to the popular email client, Mozilla 
Thunderbird and the 
SeaMonkey internet application suite. Since its an extension, Lightning is tightly integrated with Thunderbird or SeaMonkey, allowing it to easily perform email-related calendaring tasks.
CardDAV
CalDAV
Task Management
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