The Apple Blog published a number of business software applications for the Mac.
The following project administration applications were on their list of
thirty Mac business automation.
project timeline management
Daylite Productivity Suite - Incredibly full-featured project planning
automated solutions, Daylite is one of the most useful programs on the Mac
today. The full suite includes some features such a Mail integration, shared
calendars, contact management, and more.
OmniPlan - One of the newer Omni Group software applications, OmniPlan
makes heavy use of
Gant charts to help schedule and chart the work on any project you
have.
Basecamp - 37signals' flagship product, Basecamp has become the standard
for project management in many offices (especially small/home businesses).
As you can see, the software available for the MacIntosh have risen to a level
that allows project managers to perform project planning and scheduling
effectively and efficiently.