GOOPS is the object-oriented extension to Guile. Its implementation is derived from STk and Tiny-Clos. It is very close in spirit to CLOS (the Common Lisp Object System) but is adapted for the Scheme language. While GOOPS is not compatible with any of these systems, GOOPS contains a compatibility module which allows for execution of STKlos programs. Briefly stated, the GOOPS extension gives the user a full object oriented system with multiple inheritance and generic functions with multi-method dispatch. Furthermore, the implementation relies on a true meta object protocol, in the spirit of the one defined for CLOS.
gpdial_applet is a GNOME panel applet that can monitor a file and rip an integer or floating point number out of a row/column in that file and display it in a dial or gauge meter. The author uses it to monitor a file in /proc that lm_sensors updates showing the CPU temperature. Using the row/column mechanism any file in /proc can easily be monitored using this applet.
GnuDIP is a application designed to allow an ISP to publish a DNS hostname for a customer without having to assign a static IP address. Customers can maintain the address information via a CGI on the ISP's website. For those who are familiar with the dyn.ml.org part this is a simple replacement package.