The GNSSTk is sponsored by the Space and Geophysics Laboratory, within the
Applied Research Laboratories at the University of Texas at Austin (ARL:UT).
GNSSTk is the by-product of GPS research conducted at ARL:UT since before
the first GPS satellite launched in 1978; it is the combined effort
of many software engineers and scientists. In 2003 the research staff
at ARL:UT decided to open source much of their basic GPS processing
software as the GNSSTk.
https://github.com/SGL-UT/GNSSTk
Inquiries beyond those covered in the above lists can be sent to gpstk@arlut.utexas.edu .