Samhain is a file integrity / intrusion detection system that can be used on single hosts as well as on networks. It been designed to monitor multiple hosts with potentially different operating systems, providing centralized logging and baseline database storage, although it can also be used as standalone application on a single host.
Nightfall is an astronomy application for science, education, and fun. It can produce animated views of eclipsing binary stars, calculate synthetic lightcurves and radial velocity curves, and eventually determine the best-fit model for a given set of observational data of an eclipsing binary star system. Nightfall comes with a user guide, and a set of observational data for several eclipsing binary star systems.