Which is the best teaching software for photogrammetry?

The eLen photogrammetry teaching software developed by Hohai University is good, which is specially tailored for photogrammetry teaching practice, including aerial photogrammetry and close-range photogrammetry, and there is also a complete practice scheme, which basically includes all the classical algorithm experiments of photogrammetry. Other photogrammetry teaching software is a simplified or constrained version of the enterprise version for production applications, which is not conducive to students' understanding and mastering the algorithm flow and analyzing the algorithm characteristics, and is not suitable for teaching.