1. Pymap3dpure-Python (Numpy optional) 3D coordinate conversions for geospace ecef enu eci
2. GeorinexPython RINEX 2 / 3 NAV / OBS / sp3 reader & batch convert to HDF5 with C-like speed
4. matlab-rinex-readerFixed old Kai Borre Matlab code to run in Octave and hence be callable by Python to work with RINEX data