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| Source: udig.refractions.net |
DIVA-GIS is a free computer program for mapping and spatial data analysis (another free Geographic Information System). With DIVA-GIS you can make maps for small areas using, for example, state boundaries, rivers, satellite imagery, and species occurrence locations. The project website also provides free spatial data for the entire world that you can use in DIVA-GIS or other software.
Among its basic features are the creation and editing of ESRI shapefiles, it has a very simple layout interface, allows for various symbologies, attribute tables, etc. Check it out on the official website