Manifold is a GIS software that is both accessible and very complete for the visualization, analysis and representation of data. It can read more than 80 formats of data, (vector or raster) and it offers, among other things, a very powerful SQL extension as well as cartographic editing functions for a very clean result.
The 8.0 version guaranties moreover a complete compatibility with Microsoft XP, Vista & 7. It can combine perfectly with technologies such as Oracle Spatial, DB2, MS-SQL.
Also, Manifold Internet Map Server allows to develop web applications that can integrate diverse functionalities of the Manifold software.
More information: www.manifold.net