Athens Neutron Monitor: Observing cosmic ray neutrons. Background information, explanation of worldwide monitor network, detector description, publications, links.
CHICOS - California HIgh school Cosmic ray ObServatory: An active research array for the detection of ultra-high energy cosmic rays. The events CHICOS is designed to observe are single subatomic particles slamming into the Earth's atmosphere with the energy of a brick falling from a rooftop. It is a collaboration of Los Angeles-area high schools, California Institute of Technology, California State University, Northridge, and University of California, Irvine.
High Resolution Fly's Eye Experiment (HiRes): Large air fluorescence cosmic ray detector.
Homebrew Cosmic Ray Muon Detector: Schematics and diagrams for the Geiger-Mueller detectors and electronics. Information on cosmic rays, variations and other forms of detection such as scintillation.
ICRC 1995: 24th International Cosmic Ray Conference in Rome, Italy, August 28 - September 8, 1995.
ICRC 1997: 25th International Cosmic Ray Conference in Durban, South Africa, July 28 - August 8 1997.
ICRR: Institute for Cosmic Ray Research, University of Tokyo.
Pierre Auger Cosmic Ray Observatory: Aims to observe the highest-energy cosmic rays.
Sources of Highest Energy Cosmic Rays: Increased estimates of extragalactic magnetic fields may explain why possible HE CR sources, like AGN M87, do not align with observed CR directions.
STACEE: Solar Tower Atmospheric Cherenkov Effect Experiment.
WIZARD Experiments: Space-borne experiments like PAMELA, SilEye, NINA and balloons. Downloadable results, articles and pictures.