Advanced variable utilities for Tcl, including a read only variables and garbage collection for TclOO.
Full documentation here.
This package is a Tin package. Tin makes installing Tcl packages easy, and is available here.
After installing Tin, simply run the following Tcl code to install the most recent version of "vutil":
package require tin
tin add -auto vutil https://github.com/ambaker1/vutil install.tcl 4.0-
tin install vutil