Do you think that the SNAP software from ESA could be considered as an applicable software or similar to GAMMA remote sensing or, is it still an educational software?Why?
I have used SNAP and its predecessors for a while.
I would say it is a very good software, despite its small amount of instability. But, overall it is one of some freely-available software I would say comparable to similar, commercial software. The key things are what do you actually need to do.. interferometry? or just conventional backscattering explitation?
So back to your question whether the software is still in educational phase, I would argue to say no.. this software would be as heavyweight as its commercial partners to some extent.
If you want to use SNAP software for multi temporal interferometry (long-time monitoring, stacks of several images), as GAMMA, no, it is not the right software. However SNAP allows to calibrate and to coregistrate images, to generate interferogram, etc.
It really depends on your needs. If heavy-weight long-term monitoring is required, then GAMMA, or possibly its freeware cousin GMTSAR, is a definitive choice.
After more than three years, of raising this question within the researchgate, I'd like to answer it now, the continuity of developments' leap have been achieved to SNAP sw. during the last three years make this software more sophisticated and a real competent multi-platforms software.