Documentation can be found at http://tcllib.sourceforge.net/doc/tree.html .

This module of the [tcllib] data [struct]ures collection provides
the data structure portion of a tree structure.

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Tree would be more useful if nodes could be arbitrary objects (specifically, if they could be [incr Tcl] objects.)
To that end, I made some mods which [string map] {:: @} in the creation of [namespace] data arrays.
Worth adding to the mainline? [CMCc]

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[[
[Arts and Crafts of Tcl-Tk Programming] |
[Category Command], package [tcllib], module [struct] |
[Category Data Structure] |
]]