Grace is a WYSIWYG 2D plotting tool for the X Window System and M*tif. Grace runs on practically any version of Unix-like OS. As well, it has been successfully ported to VMS, OS/2, and Win9*/NT/2000/XP (some minor functionality may be missing, though).
Grace is a descendant of ACE/gr, also known as Xmgr.
The instruction set to install the source can be found in the User Guide