Orekit aims at providing accurate and efficient low level components for the development of flight dynamics applications. It is designed to be easily used in very different contexts, from quick studies up to critical operations. As a library, Orekit provides basic elements (orbits, dates, attitude, frames, ...) and various algorithms to handle them (conversions, propagations, pointing, ...).
di is a disk information utility that displays everything that df does and more. It features the ability to display your disk usage in whatever format you prefer. It also checks the user and group quotas, so that the user sees the space available for their use, not the system wide disk space. It is designed to be highly portable across many platforms and is great for heterogenous networks.
Conquest is a top-down, real time space warfare game. It was originally written in RATFOR for the VAX/VMS system in 1983 by Jef Poskanzer and Craig Leres. I spent incredible amounts of time playing this game with my friends in the terminal labs at college, and when I actually had a multi-user system running at home (Unixware) I decided to try and translate/port the code to C in Unix. This was in the early to mid 1990's. Of course, over the years many things have changed. Today, Conquest is a t