OPUS
https://www.ngs.noaa.gov/OPUS/ - processamento online
RTKLIB
http://www.rtklib.com/
GPSTk
http://www.gpstk.org/bin/view/Documentation/WebHome
GAMIT/GLOBK/TRACK
http://www-gpsg.mit.edu/~simon/gtgk/index.htm
GIPSY-OASIS II
https://gipsy-oasis.jpl.nasa.gov/