- Adium X
 - Multiple protocol instant messaging client for Mac OS X. - Apple .Mac
- Email, storage space, digital photo albums, and backup for Macintosh users.
- Apple MobileMe
- Apple's service to store and sync data via Mail, iCal, and Address Book on Mac OS X and via Outlook on Windows. Replaces .Mac.
- iCal World
- Allows users to store and publish their own open and private iCal calendars plus subscribe to others.
- iCalShare.com
- Volunteer-driven directory of shareable calendars for use with applications such as Apple's iCal and Mozilla Calendar.
- Mac Orchard
- List of applications and links for Macintosh Internet users.
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