tkinspect was written using a object system written in Tcl. The object system is really just a way to group a Tcl array and a bunch of procedures. It's part of a larger Tcl library of mine called STL. tkinspect includes a subset of that library.
tkinspect itself is public domain and you may do whatever you want with it. However, the Tcl code in the stl-lite directory was written at LBL, so those files are copyright 1995 Lawrence Berkeley Lab. See stl-lite/COPYRIGHT for the full copyright notice.
If you have any comments, questions, or bug reports please send them to me. My address is SLShen@lbl.gov.