Both GKS (2D) and GKS-3D libraries from GTS-GRAL ( GKSGRAL and GKSGRAL-3D) are available for general use on IBM VM/CMS, VAX VMS, CRAY UNICOS, APOLLO AEGIS, and UNIX. However, in the case of UNIX, compiled libraries are only available from CERN for those machines on which they may be produced.
As of March, 1990, the PROduction GKSGRAL version is 7.4/3.2, and the GKSGRAL-3D version is 2.0.