Equinux has made several announcements at this year’s Macworld Expo in San Francisco, including the availability of APC Tracker 4, a utility created for Mac OS X Servers, that now supports USB equipped UPS devices. The price for an APC Tracker 4 license is US$129.90. Upgrades from previous 3.x versions are free and the price to upgrade from 1.x, or 2.x starts at $80.