DsTool version 3 was contributed to by authors of SaVi, and shares Tcl/Tk code. It can work with Geomview.
DsTool has since been superseded by PyDsTool. PyDsTool can export to Geomview via PyCont's
Here are archival copies of the DsTool source code and manual (including a larger pdf conversion), along with diffs tracking changes to the other unofficial sourcecode tarballs available.
This DsTool source can be compiled with modern gcc on 32-bit (not 64-bit!) operating systems with Tcl/Tk 8.5 (not 8.6!). Compilation can be done with e.g.: