Grace is a WYSIWYG 2D plotting tool for X Windows System and Motif (recent versions of Lesstif should be fine too). Grace is a descendant of ACE/gr, also known as Xmgr.
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.