Particle Universe is the particle engine for Ogre based applications. You can check the demo for particle universe at FXpressions.

Free or Paid ?

It is paid application. It costs €9.95 bucks for the product.

What are the features ?

- Editor with example scripts
- More than 55 affectors, emitters, observers, handlers and renderers
- PhysX support
- Particle System LOD
- Soft particles
- Atlas texture support and atlas tool
- Manual, tutorial and API description
- And more …

New version of particle universe is just released. That is version 1.1, so if you want to check it you can do so at FXpression site.