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There's an alternative, ISIS, the program the USGS and NASA use to work with the images. It's free but runs only in Unix-like systems like Linux or Apple's OS X.
Most modern computers will boot from a memory stick, so why not install Puppy Linux on a memory stick and then use ISIS?
Puppy has its own environment like a live CD does, it is a standalone system running as root, but it uses files to store the data from last session (if you want to store it). You can connect to other network places from it of course.
This way you could have a 16Gb memory stick with Puppy on it, boot from that, running ISIS and store all the data, label, & img files in another partition on the memory stick.