What: PVM
 Where: http://www.nyx.net/%7Edminer/pvm/ 
 Description: Paradigm Visual Make is a software development environment
        written in Tcl/Tk.  It incorporates a text editor, software
        project (aka makefile) editor and enables you to develop and
        build your packages within a single program.  It can start an
        external debugger, and execute almost any external text program,
        putting its output into a specialized PVM text window.  It
        looks like a Microsoft MDI application.  Requires Unix, X,
        Tk 4.1 or higher, and xlsfonts.
 Updated: 08/1998
 Contact: mailto:[email protected]  (Andrew Guryanov)

An entirely different PVM, but one which also has a Tcl story, is Parallel Virtual Machine [L1 ]. More on this, later ...

 What: CODE
 Where: http://www.cs.utexas.edu/users/code/ 
 Description: Tk/Tix based system to produce parallel programs for the
        Sequent Symmetry as well as other PVM-based
        networks of heterogeneous machines.
 Contact: mailto:[email protected]  (Emery Berger)
 What: OMNeT++
 Where: http://www.hit.bme.hu/phd/vargaa/omnetpp.htm 
 Description: A C++ based discrete event simulator, featuring a graphical
        model editor, textual model topology language, simulation class
        library, process based activity description, run time user
        interfaces (batch, graphical, TVision), message flow and
        statistics animation, interactive simulation, tracing,
        random seed generaator tool, result analysis and plotting and
        support for PVM parallel Virtual Machine.  Tcl/Tk used to build
        several of the graphical tools.  Has been ported to Windows 95/NT.
        Currently at version 2.1 .
 Updated: 07/1998
 Contact: mailto:[email protected]  (Andras Varga)
        mailto:[email protected] 
 What: XPVM
 Where: ftp://netlib2.cs.utk.edu/ 
 Description: Tk front end to monitor and debug PVM 3.3 or higher.  PVM
        is a package for developing parallel computing applications.
 Contact: mailto:[email protected]  (Xiaokun Zhu)
        mailto:[email protected]  (James Arthur Kohl)
 What: Tkpvm
 Where: http://www.cogsci.kun.nl/tkpvm/welcome.html 
        http://www.epm.ornl.gov/pvm/ .
 Description: An interface between a parallel virtual machine library
        and Tcl/Tk.  Treats a number of machines as if they were really a
        single machine.  Also has an enhanced capability to communicate
        between processes.  Each process in the virtual machine communicates
        through a pvm-channel based send command rather than Tk's X11
        based send command.  Supported only on Tcl 7.6plus (or Itcl 2.1),
        Tk 4.2plus, and PVM 3.3.x.
        Tkpvm does not yet work with Tcl 8.0 or PVM3.4.
 Updated: 10/1998
 Contact: mailto:[email protected]  (Jan Nijtmans)
 What: Tcl and Tk shared library support (aka Plus Patches) (Nijtmans)
 Where: http://www.purl.org/net/nijtmans/plus.html 
 Description: The plus-patch files for Tcl/Tk 8.x adds varying types of
        fixes and enhancements.  At some point during development, versions
        fixed the event-handling of Tcl such that Tk could be loaded
        dynamically.  Other bug fixes and enhancements (such
        as the ones from Trf 1.0) are also present, such as the elide
        patch required for tkman, dash and Img patches for Tk,
        fileevent patches for Windows, Cygwin-B20.1 support and more.
        These work on both Unix and Visual C++ on Windows.
        These patches are compatible with the dash and img patches
        and extensions as well.
        Patches for Tclx (code and help), Tix, and tcl plugin are included
        with the plus patch distribution.
        Note that on the ftp site, tar files containing the fully patched
        versions of Tcl and Tk are available, for folks wanting to use
        Tkpvm but unable to apply the patches themselves.  These files
        also have the dash patch applied.
        The ftp site may have patches for older Tcl/Tk versions.
        Versions thru Tcl/Tk 8.2 are available.  Note that as the core team
        incorporates Jan's fixes, they will disappear from future versions
        of the patches.  Plus patch Windows users are encouraged to upgrade
        to the latest plus patch version.
        This file includes patches for itcl, itk, and iwidgets.
        Provides enhanced dynamic loading,
        ability to create stand-alone executables, additional image
        formats, includes tkcon (version 0.70), includes new channel
        Currently the plus patch works with Tcl up through 8.3.1 .
 Updated: 10/2001
 Contact: mailto:[email protected]  (Jan Nijtmans)
        mailto:[email protected] 

TISAS (TIme Series Analysis Supporting system) presents a GUI for time series analysis, where data, derived statistics and fitted statistical models are expressed as objects. TkPVM is used to carry out calculations on large data sets in parallel. Data transformations can be designed by manipulating graphical objects in the GUI