Spynergy is a pure-Tcl toolkit, created by [Steve Wahl] and [Michael Doyle], which is included with the [BOOK Interactive Web Applications With Tcl/Tk].  

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From the book’s back cover:

“The CD includes the latest releases of Tcl/Tk and the Spynergy® Toolkit, a collection of Tcl/Tk procedures you can use for your own projects. The Spynergy Toolkit gives your applications powerful abilities such as HTML rendering and browsing, creating and managing databases, client/server computing, Web information retrieval, cross-platform file manipulation, and distributed processing. You receive complete instruction on how to use the Spynergy Toolkit to build a Tcl/Tk database, a Tcl/Tk Web browser, a Tcl/Tk Web server, and other advanced Internet applications.”

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[MDD]: It was developed to be compatible with Tcl 7.6 through 8.0, but hasn't been updated since then.  The tools all seem to work fine with current versions, though.