I'm also looking for orthorectification software.
I want to make photos from my powered paraglider, with ground control points and elevation data from conture lines. The camere would be a DSLR without camera calibration and marks.
I found GRASS, OSSIM and eFOTO as Open Source Softwares from Orthorectification.
All of these software can create orthophoto, but until now i wasn't able to test is. Which of these software are most suitable for my needs? Any of you tried these?
What about commercial software?
Any help is appriciated