Astrology Chart Software
Steven uses and recommends Matrix Astrology's Winstar Pro Software for PC. Winstar Pro includes a full range of software, including Horizons, a great program for location-based astrology.
Steven also sometimes refers to Solar Fire but mainly uses Winstar in his practice. Both programs are available for the PC.
Looking for software for your Mac? Try Time Passages. Astrograph also offers an astrology app for the iPad and iPhone.