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
EssentialPIM is a cross-platform personal information manager with a focus on user-friendliness and integrated task management, while Kontact is an open-source solution tailored for KDE users, offering extensive customization and integration but with a steeper learning curve.