Atlas Gaming are using Bullet Physics for simple effects in their slot machines (found in pubs/clubs/hotels/casinos in Australia):
Typical uses will be:
- a fountain of coins, with collision which react to players touch input
- soft body collision (flags) which also react to players touch input
We use Bullet on our slot machines and handhold versions of games.
Some pictures (from our website):
http://www.atlasgaming.com.au/#!angkor-gold/c46q