tinyblu - Never neglect your friends again. See how long it's been since you last hung out.

Google Calendar - Spend less time managing your day & more time enjoying it

Pakker - Pakker is an easy to use personal database with a visual form designer and easy sharing.

Mixmax Calendar - The fastest way to schedule meetings with anyone, anywhere

Windows Contacts - Windows has many extraordinary organizers, and in the event that you include distributed storage, then you presumably have more.

Sunsama - Calendar and scheduling for teams