StarCalc is described as 'The fastest professional astronomy planetarium & star mapping program for Windows 9x/ME/NT/2000/XP (StarCalc version for PocketPC vailable). It illustrates star positions of any instance of the day observed from any geographic locations on the Earth' and is a Star Map in the education & reference category. There are more than 25 alternatives to StarCalc for a variety of platforms, including iPhone, iPad, Windows, Android and Mac apps. The best StarCalc alternative is Stellarium, which is both free and Open Source. Other great apps like StarCalc are Celestia, Sky Map, KStars and Gaia Sky.