Contact Manager (OS X)
Store information and categorize your personal and business contacts.

OmniOutliner
Organize papers, projects, or your thoughts.

Circus Ponies NoteBook
Clip, organize, and share unstructured notes and information.

Mozilla Sunbird
Keep track of your appointments with this cross platform calendar application.

PocketMac Pro
Connect Macintosh computers and Pocket PC PDAs enabling them to share/synchronize data with each other.