One of their software products is a Requirement Traceability tool call SLATE.  Per their website [http://www.plmsol-eds.com/slate/index.shtml] they are currently on version 6.0 of SLATE [http://www.plmsol-eds.com/pdf/WhatsNew60-2.pdf] which uses Tcl/Tk 8.0.5 (and TclPro).

 per their website...
'''SLATE''' (System Level Automation Tool for Enterprises) addresses these problems by: 
   * Bringing requirements to everyone on a project--requirement groupware (ensuring that no one is working from stale information) 
   * Integrating requirements with the design (where requirements can influence design towards compliance, rather than testing/integrating compliance in later) 
   *Providing accurate design documentation that is a reflection of the team-captured design (changing design changes the documentation)