SOFTWARES: ENVI, ERDAS IMAGINE AND PCI
1) FREE SOFTWARE----ERDAS http://www.fiberdownload.com/Download/19541/Erdas-Imagine
2) FREE SOFTWARE.......ENVI http://mac.wareseeker.com/download/envi-x-4.2.rar/329850
3) FREE SOFTWARE.......http://download.cnet.com/PCI-Geomatica/3000-2053_4-72798.html