There's always BlackBerry Desktop for Mac and iCal/Address Book.
You might find some Linux solutions as well.
In addition to MS Outlook (used by 95% of the business world), BlackBerry Desktop Manager supports these:
xxx8226; ACT!xxx8482; 4.0.2/2000
xxx8226; GroupWise 5.5/6
xxx8226; Lotus Notes 4.5/4.6/5
xxx8226; Lotus Organizer 5/6
xxx8226; Microsoft Schedule+ 7.5
xxx8226; Microsoft Schedule+ Default