1. The document discusses how to connect various GIS software including ESRI ArcGIS, MapGuide, MapServer, and GeoServer to PostGIS spatial databases.
2. Basic steps for connecting MapGuide to PostGIS include downloading the FDO provider, copying files, and creating a provider configuration file.
3. For MapServer, PostGIS support must be compiled in and the CONNECTIONTYPE parameter set to POSTGIS, with CONNECTION used to specify database connection details and DATA to define layers from PostGIS tables.
4. GeoServer supports connecting directly to PostGIS spatial tables.