Billings, the award-winning time tracking and invoicing software that makes professional invoices in minutes, is now compatible with Mac OS X Leopard with the immediate release of version 2.5.5. This release integrates easily into existing Mac productivity workflows, co-operating fully with Mac OS X’s Address Book, publishing events to iCal, and making information available via Spotlight. [ Price: from US$59 ~ Requires: Mac OS X 10.4 or later ~ Leopard support ~ Demo available ]