Hydra
Adaptive particle-particle, particle-mesh plus smoothed particle hydrodynamics code.
http://coho.physics.mcmaster.ca/hydra/

The Review of Particle Physics
Description goes here.
http://www-spires.dur.ac.uk/HEPDATA/PART/

Particle Technology Labs, Ltd.
Full service laboratory specializing in the sizing and characterization of fine particles for pharmaceutical manufacturers; over ten different particle sizing instruments.
http://www.particletechlabs.com

Particle & Particle Systems Characterization Book
Measurement and Description of Particle Properties and Behavior in Powders and Other Disperse Systems.
http://www.wiley-vch.de/vch/journals/2056/2056_info.html

Particle Velocity Acoustical Sensors
Mambo - the dynamic portal engine and content management system
http://www.microflown.com

Christison Particle Technologies Ltd.
Christison Particle Technologies supply the best equipment for particle size reduction and particle size analysis
http://www.christison.co.uk/

nMod Particle-Particle nBody Model
SourceForge.net. Fast, secure and free downloads from the largest Open Source applications and software directory.
http://sourceforge.net/projects/nmod/

Micromeritics Instrument Corporation
Micromeritics Instrument Corporation manufactures a complete line of particle characterization instruments to measure particle size, surface area, porosity, chemisorption, shape and density.
http://www.micromeritics.com/

Institut de Fisica d'Altes Energies (IFAE-Barcelona)
High Energy Physics Institute with research groups in experimental and theoretical particle physics. IFAE participates in several international projects in accelerator-based particle physics and particle astrophysics.
http://www.ifae.es/

Quantum Universe
Extensive content on 21st century particle physics and the role of particle colliders.
http://www.interactions.org/quantumuniverse/