What you’re saying it quite the opposite to what it actually is. All docs are in one place (well, two places both hosted at tcl.tk), one of them is the actual d

What you’re saying it quite the opposite to what it actually is. All docs are in one place (well, two places both hosted at tcl.tk), one of them is the actual docs (also installed as manpages on your system), and the other one is the wiki, a huge source of useful information written by both developers and other users. I can't think of how Tcl/Tk docs can be massively outdated given that Tcl/Tk maintains almost 100% backwards compatibility, so most of the old advice works just as is. Regarding open source, nearly all tools are not only open source, but usually under very permissive licenses (e.g. Expat or BSD-2), and there are in fact very few commercial closed-source tools (basically Komodo, what else?). Are you sure you actually tried Tcl/Tk and not something else?