1) Two different particle systems(Asteroids and ships) repeling from each other and interacting with the mouse. When they're close it creates a line between the ship and the asteroid, the intention was to explode the asteroid but I couldn't kill it.
2) Simulation of colored fog. The smoke are particles that repel from where there is difference captured from live video, using also OpenCv
3) 2 different particle systems that interact with each other. The points repel away from the "animal/thing" when close and then return to their original position. Vector field also is used in this example to give a more natural and unpredictable movement.