Quantum GIS (QGIS) is a map data generator. When you have to generate any type of map or similar project you will have to use all kinds of external sources in order to get the right set of map data and similar information for your project.
In most cases these types of data are not really all that reliable and in most cases you will often have to spend a lot of time making sure that they are the things that you are looking for. This is why itâ€™s much better to get Quantum GIS (QGIS) and just avoid all this trouble.
With Quantum GIS (QGIS) you can easily generate any sort of map data that you might need and use it for your own purposes in any way you want. You will no longer be limited with all those constrains that foreign sources provide.