"The Generic Mapping Tools, GMT, are an open source collection of tools for manipulating geographic and Cartesian data sets (including filtering, trend fitting, gridding, projecting, etc.) and producing PostScript illustrations ranging from simple x–y plots via contour maps to artificially illuminated surfaces and 3D perspective views. It is released under the GNU Lesser General Public License."
Go to the GMT installation webpage and download the appropriate GMT-5.X.X package for your system:
http://gmt.soest.hawaii.edu/?id=Installing
- OS X: download the application bundle gmt-5.X.X-darwin-x86_64.dmg
- Windows: download the application bundle gmt-5.X.X-win64.exe
- Linux: Follow the installation instructions