Kontact is a personal information manager and groupware software suite developed by KDE. It supports calendars, contacts, notes, to-do lists, news, and email. Developed by KDE
License: Open Source
Kontact is a comprehensive PIM solution with a strong focus on integration and customization, making it ideal for personal use. Zimbra Desktop, on the other hand, excels in collaboration and group functionalities, appealing to users in organizational settings.