I need to a map software that enables me to produce a thematic world mapshave: the World "Map" such that I can color some countries on the earth in one color and other countries in another color and so on with a legend to denote each color to create a group. For example, I want to color some countries with low income levels "red", other countries with middle income level "blue" and the rest of the countries "green". Please suggest some easy software: freeware, shareware, open source, or commercial. It must be very easy to work with. I do not need more than the world map and the ability to handle information with it. You will also help me intorducing the software and do 3 maps in this manner urgent.