Flex Projector is a freeware application for creating custom world map projections. The intuitive interface allows users to easily modify popular world map projections or create completely new projections.
GISLook and GISMeta are plugins for Mac OS X that show GIS data in the Finder. GISLook previews these formats: ESRI Shape, E00, ArcInfo Coverage and various raster grids. GISMeta shows the size of GIS grid files.