Package Author: Astrodienst AG and Alois Treindl
Astrolog is relatively unique in astrology software for the following reasons:
(1) It's 100% freeware. :)
(2) It runs on multiple platforms, such as DOS, Windows, Mac, and Unix.
(3) The full source code is available.
(4) Features are accessible from the command line and from shell scripts.
(5) It offers many features not found in most other programs.