Open Source & Free GIS Application: Quantum GIS
Free cluster detection software: SatScan
Open Source & Free Statistical Package: R
Related packages in R: sp, spatstat, gstat
Open & Free Geostatistical tool: Open Geoda
Statistics Tutorial by B. Burt Gerstman : http://www.sjsu.edu/faculty/gerstman/StatPrimer/
My Collection of R Code / Scripts: https://rindonesia.wordpress.com/