Particle Physics is being split off from Minechem. If you're upgrading to ParticlePhysics from Minechem pre-5.0.5-Dev4, please read about how to upgrade.
You can download the latest Particle Physics builds from Jenkins. Please report any bugs, and be aware that Particle Physics isn't quite stable yet.
The basic principles can be seen in BevoLJ's showcase of Minechem and Particle Physics.
Particle Physics is licensed under the DBaJ non-commercial care-free license.
More information about Particle Physics (and why it was split off from Minechem) can be found on the Particle Physics page.