A Free Calendar For Your Desktop Computer
Calendar - Manage your day effectively, for free!
Free desktop calendar and planner
Calendar application from the creator of Firefox
Amazing Supervisor
Amazing Supervisor helps you work and study more productively
Lightning
Add a complete calendar to Thunderbird
eM Client
<p>eM Client 5 - your emails, contacts, calendar and instant messaging effectively</p>
Mobile Master
Manage your phone's information from your PC