I'm dorothyr. I've been messing around with Tcl/Tk way longer than anyone should.
I maintain TkRev (formerly TkCVS) and I maintained TkDiff for a few years. Recently I tried to use TkMan and discovered that it didn't work with Tk > 8.4 and it seems to be completely abandoned, so I fixed the text widget issues and forked it as TkReadMan.
The Tcl/Tk projects I work on:
TkRev https://sourceforge.net/projects/tkcvs
TkDiff https://sourceforge.net/projects/tkdiff
I did a fork of TkMan that worked with Tk8.6, but Tom Phelps made me take it down. I disagree that it was a "hostile takeover" but I'm not going to argue.