Unity Animation of Particles Interacting

Example animation I made with Unity game engine (sort of overkill really):

- Original art, Howard T. Chiam, Nov. 2014 -

A way-better, final version I made for a knowledge-translation course assignment on "green pollution-reducing paint" is at this link here:  https://dl.dropboxusercontent.com/u/46617516/KTVideoIntroIdeas.html

Unity is a game engine, basically a program that you can use to make 2D and 3D video games.  There's a free version that has tons of features so you can make your own games for free and export them to exe's for different platforms.
http://unity3d.com/

I made an example game in an earlier post:
http://hchiam.blogspot.ca/2015/01/my-petrify-game.html
Controls:  a=left, d=right, w=up, s=down.