/usr/bin/GWorkspace is in gworkspace.app 0.9.3-1+b2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/../lib/GNUstep/Applications/GWorkspace.app/GWorkspace
/usr/bin/../lib/GNUstep/Applications/GWorkspace.app/GWorkspace