Download the source code: glambient-src-0.9.zip.
The Glambient application currently runs only on win32. It was originally developed on Linux, and porting back to Linux should not be that difficult if you are determined. The application consists of about 10,000 lines of C code and a few hundred lines of Tcl. It is riddled with bugs.
Tcl/Tk is a lousy scripting language with a great user interface toolkit.
the Img library allows Tcl/Tk to read JPEG images (and more).