X-Plane is a flight simulator that reads in the geometric shape of any aircraft and then figures out how that aircraft will fly. It does this via an engineering process called "blade element theory", which involves breaking the aircraft down into many small elements and then finding the forces on each little element many times per second. These forces are then converted into accelerations, which are then integrated to velocities and positions. This gives X-Plane the most realistic flight model available for personal computers.
IPAcco is a software package that helps a network admin to collect, visualize, and analyze IP accounting data from the Cisco routers. It downloads IP accounting data from the router, stores it in the MySQL database, provides Web access to the collected data, presenting it in a convenient graphical form, and allows the user to specify various criteria for data selection.