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GMTSAR is an open source (GNU General Public License) InSAR processing system designed for users familiar with Generic Mapping Tools (GMT). The code is written in C and will compile on any computer where GMT and NETCDF are installed. The system has three main components: a preprocessor for each satellite data type (ERS-1/2, Envisat, ALOS-1, TerraSAR-X, COSMOS-SkyMed, Radarsat-2, Sentinel-1A, and ALOS-2) to convert the native format and orbital information into a generic format; an InSAR processor to focus and align stacks of images, map topography into phase, and form the complex interferogram; a postprocessor, mostly based on GMT, to filter the interferogram and construct interferometric products of phase, coherence, phase gradient, and line-of sight displacement in both radar and geographic coordinates; GMT is used to display all the products as postscript files and KML images for Google Earth. A set of C-shell scripts has been developed for standard 2-pass processing as well as image alignment for stacking and time series. ScanSAR processing is also possible but requires a knowledgeable user. Users are welcome to contribute to this effort. In particular contributions using other scripting languages such as Perl and Python are desired. DOWNLOAD: http://topex.ucsd.edu/gmtsar/downloads/ Installation of GMT5 and GMT5SARhttp://gmt.soest.hawaii.edu/projects/gmt5sar/wiki