You could have downloaded SimpleDemViewer 7.5.6 for Mac from our application library for free. This free software for Mac OS X was originally designed by Yoshiaki Katayanagi. The application lies within Education Tools, more precisely Science.
From the developer:
SimpleDEMViewer browses DEM (Digital Elevation Model) data as pictures. It displays color elevation maps with shading. It supports gtopo30, etopo2, etopo5, globe, srtm, srtm dted, hydro1k, and many bil form data. User should prepare DEM data separately. You can make Mercator projection map, Corn projection map, orthographic projection maps. You can show pictures, movies or Web pages linked to any places on the earth using memo function.
You may want to check out more Mac applications, such as Trapcode Particular, Calcline or AstroGrav, which might be similar to SimpleDemViewer.