Aside from using Octave for 90%+ of my own thesis work at the University of Colorado in Boulder, I have contributed to a project called CISM-DX. This is a collection of analysis and visualization tools based heavily on Octave and OpenDX? that is being developed as part of the NSF-funded Center for Integraged Space-weather Modeling (CISM). I don't think it (CISM-DX) has been used extensively in a traditional class setting, but it has been used in CISM's annual "summer school", a crash course intro to applied space physics held each year at Boston University. I wouldn't be surprised if others more familiar with CISM-DX are lurking about this list that could tell you more if they just spoke up.