This is the interactive executable, based on GLFW. Display GRIB2 fields with OpenGL. Raster, contour, vector, colorbar, mapscale, coastlines, borders. Lat/lon, lambert, gaussian grid. GLFW backend for interactive display, EGL backend for batch processing without X11 display. Perl/Tk interface. Tested on : - VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller (rev 06) - VGA compatible controller: Intel Corporation HD Graphics 530 (rev 06) - VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Wani [Radeon R5/R6/R7 Graphics] (rev c8) - 3D controller: NVIDIA Corporation GV100GL [Tesla V100S PCIe 32GB] (rev a1)