EDE (Equinox Desktop Environment) is simple, fast, and user-friendly environment. It works on all popular Unix and Unix-like operating systems.
STk is a free R4RS Scheme interpreter which can access the Tk graphical package. Concretely, it can be seen as the standard Tk package where Tcl has been replaced by a Scheme interpreter.
A PHP script to build your own classifieds site.
An implementation of a cryptographic store accessible through PKCS#11.