Marketcircle today released a free public beta for Billings 2, its latest software designed for the unique needs of Mac-based business and creative professionals. Billings 2 tracks time and expenses, and creates detailed, customized invoices, project estimates, and reports. Available as a final production version by the end of this year, Billings 2 can be purchased for US$49 during the month of November, and $59 starting December 1.