GMT is a collection of tools that allow users to manipulate (x,y) and (x,y,z) data sets (including filtering, trend fitting, gridding, projecting, etc.) and produce Encapsulated PostScript File (EPS) illustrations ranging from simple x-y plots through contour maps to artificially illuminated surfaces and 3-D perspective views in black and white, gray tone, hachure patterns, and 24-bit color.
GMT supports many common map projections plus linear, log, and power scaling, and comes with support data such as coastlines, rivers, and political boundaries.
Website: http://gmt.soest.hawaii.edu
Licence: GNU General Public License (GPL) version 2
Software Version: 4.5.2
Supported Platforms: GNU/Linux, Mac OSX, MS Windows
API Interfaces: Command line