The SLgtk package binds the Gtk2 and GtkExtra widget sets to the S-Lang scripting language (www.s-lang.org). SLgtk wraps more than 2200 functions from Gtk2 and its constituent libraries, includes over 4500 lines of sample code in 40+ working guilets. The distribution also bundles a code generator (SLIRP) which can be useful for building additional S-Lang modules from C, C++, or FORTRAN, as well as straight C wrappers for C++.

SLgtk also includes a visual version of the powerful S-Lang "where" command, extensions to and performance enhancements for several GtkExtra widgets, and a pixbuf loader for the FITS image file format widely used within astronomy.