ArcExplorer for Mac

From ESRI:

ArcExplorer is a lightweight GIS data viewer developed by ESRI. This freely available software offers an easy way to perform basic GIS functions. ArcExplorer is used for a variety of display, query, and data retrieval applications and supports a wide variety of standard data sources. It can be used with local data sets or as a client to Internet data and map servers such as those freely available off of ESRI's Geography Network at www.geographynetwork.com.

Among its many uses, ArcExplorer is an excellent vehicle for publishing your data. You can distribute the ArcExplorer setup and your data on CDs. Users can then use the CD to install ArcExplorer on their machines and view your data easily and effectively. And best of all, ESRI does not charge any fees for you to distribute ArcExplorer with your data.