From Churr Software:
Stock Investment Guide (SIG) is specifically for performing the analysis used by stock investment clubs. SIG can read and write standard .ssg file formats, create semi-logarithmic graphs of stock data, and perform a complete stock investment guide. No longer are Macintosh users forced to run expensive Windows-only software to perform stock club analysis.
Users can input stock data by hand, or download thousands of .ssg data files from the national association for investments clubs with their online premium service. Users can also trade .ssg files with fellow club members, even if other members use Windows