1)   Pimero Free Edition 2007.R6
Pimero is a convenient appointment calendar, task list planner and contact manager. With its automatic, serverless synchronisation every PC is up to date at any time. Additionally you get a stylish and modern user user interface.
datebook, Peer to peer, P2P, appointment, appointments, event, events, diary, calendar, agenda,

 2)   Pimero 1.10
Pimero is a convenient appointment calendar and task list manager - the ideal companion for small teams and individuals. With its automatic, serverless synchronisation every PC is up to date at any time. Additionally you get multi-user capabilities.
datebook, Peer to peer, P2P, appointment, appointments, event, events, diary, calendar, agenda,

 3)   Agendus for Windows Outlook Edition 4.31
Agendus for Outlook provides a comprehensive way to simplify schedule management, information entry, contact history, and the customization of how your information appears. It is the Microsoft Outlook "boost" that you've been waiting for.
Outlook, Windows, Contact Management, Schedule, To Dos, Task, Business, organizer, schedule, scheduling,

 4)   Agendus for Palm OS Professional Edition 12.05
Better organize your mobile life! Four-in-one: Contacts, Meetings, To Dos, & Memos, it’s the ultimate combination of personal information management and convenience
Contact Management, Schedule, To Dos, Business, organizer, schedule, scheduling, contacts, datebook, email,