Simulation Software

• 
  Ngspice

  Free

  Open source spice simulator.

• 
  FlightGear

  Free

  An open-source flight simulator.

• 
  OpenRocket

  Free

  A free, fully featured model rocket simulator that allows you to design and simulate your rockets before actually building and flying them.

• 
  eCity

  Free

  Virtual city environment for engineering problem based learning.