QGolf was developed for radio amateurs to clarify the behaviour of a signal on an antenna. It demonstrates the forces that act on a rope if you move one end of it: you can see how waves are reflected, how resonance occurs, and how multiple pulses coexist on the same rope. Various parameters can be updated during the simulation.
The Directory Server NT Authentication Module project is made of two parts: The first is a simple daemon which takes an NT user's domain credentials (including password) and attempts to authenticate via the SMB protocol with those credentials. The second part is a plugin which takes an LDAP DN and password and discovers the DN's NT domain identifier (if the entry has such an ID). The daemon will only listen on localhost, so the credentials are not exposed via the network, and it does not run as root, so that compromise can be limited. It attempts to locate all the domain controllers for an arbitrary domain, so failure of one DC does not cause the module to fail the authentication attempt unless no DC can be found that will accept the credential.
Agendaroids is a game where you maneuver a space ship in a field of asteroids, and shoot at them to break them into smaller pieces. It uses vector-based graphics with fixed-point trigonometry, so it runs well even on the FPU-less VR3, but it also runs on any other Xlib-based system.