What:	TkTreeCtrl
Where:	http://sourceforge.net/projects/tktreectrl http://members.cox.net/tom.wilkason/tcl/tktreectrl.zip http://hem.fyristorg.com/matben/download/tktreectrlMac.tar.gz
Description:	Multi-column hierarchical listbox widget. C code, Stubs enabled, and requires Tcl/Tk 8.4 private headers to build. Tested on Windows and Linux. Currently at version 2.2.9. Included in ActiveTcl and [TclTkAqua].
Updated:	2009-05
Contact:	See web site

Even though this is the real name of the package, the discussion in the past has taken place over at TkTreeCtrl.

apn's fork at https://github.com/apnadkarni/tktreectrl is currently the most recent/best-maintained fork.

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