Sudognu is a command line sudoku solver and
creator. It can display the logical steps it uses
to find the solution. Sudognu can print four
sudokus to a PDF page, and it comes with example
CGI scripts for integration into Web sites.
Cubex is a Web-based Rubik's Cube solver that produces a highly-detailed solution for any mixed-up Rubik's Cube in seconds.
Some chemistry-related programs for the GNOME desktop.
A mount and ACPI GUI for NetBSD.