High Quality Content by WIKIPEDIA articles! In computing, Gist is a scientific graphics library written in C by David H. Munro of Lawrence Livermore National Laboratory. It supports three graphics output devices: X Window, PostScript, and Computer Graphics Metafiles (CGM). The library is promoted as being small (writing directly to Xlib), efficient, and full-featured. Portability is restricted to systems running X Window (essentially the Unix world).