It runs on multiple platforms, such as DOS, Windows, Mac, and Unix. The full source code is available.
Features are accessible from the command line and from shell scripts.
It offers many features not found in most other programs. Positions of Sun through Pluto and the house cusps. Positions of Chiron and the four main asteroids. Positions of True and Mean nodes, Part of Fortune, Vertex, and East Point. Positions of Lilith.