I've added instructions for compiling Ruby on Mac OS X (thanks Kevin) and on Linux. Also filled in most of the missing Python and Perl code snippets, though there are still a couple left to go. I regenerated all the screenshots too, using fairly recent versions of all three operating systems.
Information you need to build high-quality Tk user interfaces.
- Tk Backgrounder
- Installing Tk
- Widget Roundup
- Languages Using Tk
- Official Tk Command Reference
(Tcl-oriented; at www.tcl.tk)