Dear Omer,

You might want to try Quantum GIS. A very good and Open Source GIS software.

You can find the Mac OS X installers here:

http://www.kyngchaos.com/software/qgis

For more info: http://qgis.org

Dear Kostas

thank you

I tried to install, but I could not

and I could not find OSX 10.9 version

R together with ggplot2 and ggmap. The learning curve is quite steep, but R is open source and can be downloaded at r-project.org. There is a very active epidemiological community using R.

if you want to install QGIS on OSX 10.9 you should reinstall GDAL and maybe python modules. Try the following threads for more help:

http://gis.stackexchange.com/questions/75186/any-experience-with-osx-and-mac-osx-maverics-using-osgeo

http://osgeo-org.1560.x6.nabble.com/QGIS-on-OS-X-10-9-td5085395.html

Epi-Info I understand now has some mapping capabilities, but I haven't used it. It is free. There is of course ArcView, which is not free. Some other free ones are CrimeStat and SatScan, both excellent and easier to use than ARcView. There are probably others that are free.

Thanks to everyone for helps.

Dear Jerry

I think Epi-Info for Windows, but I need mac version.

Thanks Trevor.

i have used both Geoda and qgis. They are good for basic mapping but qgis is a bit difficult to install on mac os.Also,many plugins for qgis dont work in mac OS. Finally, both work better in a windows enviroenmnt but you can find better options for windows.