Large-area detector networks
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ALTA Alberta Large area Time coincidence Array  
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CHICOS California HIghschool Cosmic ray ObServatory  
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CROP [Cosmic Ray Observatory Project] (high school project in Nebraska)  
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HiSPARC [High School Project on Astro-Physics Research with Cosmics] (in the Netherlands)  
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NALTA [North American Large area Time coincidence Arrays]  
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NYSCPT [New York Schools Cosmic Particle Telescope]  
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WALTA [WAshington Large Area Time coincidence Array] (university + schools project)  
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LOFAR [LOw Frequency ARray] and the prototype station LOPES. (see also here, in Dutch)  
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CODALEMA [Cosmics Detector Array Logarithmic ElectroMagnetic Antennas]  
Other detectors/experiments