Linux.com: Kontact Personal Information Manager

“KDE’s Kontact personal information manager acts as a
centralized viewing and editing interface for email, contacts,
to-do list, calendar, and notes. Kontact provides you with a
Summary view of all the important information you have stored on
computer. It also warns you when birthdays and anniversaries are
fast approaching, and can even tell you the weather conditions in
as many cities as you set it up to show. It’s pretty good-looking
to boot.

“Kontact lets you customize the contents of its Summary View
page. To add or remove categories from that page, go to the
Settings menu and select Configure Summary View…”