Contact: zeng @ zegraph . com      Last update: September 2016

CGER METEX -- a freeware developed by the Jiye Zeng for air trajectory calculation.

OpenGL -- the rendering engine of ZeGraph.

cairo -- used by ZeGraph for 2D plot.

SFL -- The Standard Function Library used by ZeScript.

CEPHES -- math library used by ZeScript's matrix library for statistics and special functions.

NetCDF -- an interface for array-oriented data access used by ZeGraph.

HDF -- a library for scientific data management used by ZeGraph.

GSHHS -- the place to download global coastline data.

ETOPO -- NOAA' web site for global relief data. Here is another site for ETOPO data (resulted from google search of "netCDF etopo60").

Mesa -- a 3D graphics library with an API which is very similar to that of OpenGL.