Alphatk is a text editor that was originally inspired by the Mac OS-only editor, "Alpha", which was written in C, but Alphatk was rewritten in Tcl to run on any platform that Tk runs on: Windows, Unix, and Mac OS X. Alphatk is most useful for: * programmers of more than 40 different supported programming languages. * those writing a lot of TeX or LaTeX documents; and * those editing HTML source files. A large part of Alphatk's functionality is provided by the open-source AlphaTcl library of code. There are several hundred thousand lines of code.