This is a small test application using c++, Irrlicht 3d engine and the bullet physics engine.
You can shoot cubes onto a plane surface and watch them collide.
On a debian based system try this to solve building dependencies (tested on kubuntu):
apt-get install build-essential cmake
to build use these commands in the irrlicht_bullet directory:
mkdir build cd build cmake ../.
git http viewer: irrlicht_bullet