For the hyperspectral people using Spectral Python: Version 0.19 was released just today.
For the hyperspectral people not using Spectral Python: Give it a try!
It has functions for reading, displaying, manipulating, and classifying your data and of course it is FOSS.

https://github.com/spectralpython/spectral

Perhaps there is some need for a short introduction into the topic? Let me know in the comments.