• Tucson Amateur Packet Radio (TAPR)
• Automatic Position Reporting System (APRS)
• North American Digital Systems Directory
• ATHNET - Athens, Greece Packet Radio Internetworking Group
• Bavarian Packet Radio Group - Baycom Packet support.
• Colorado Digital Working Group
• Digigrup EA3 page (Spanish).
• Indiana Digital Experimenter's Association (IDEA)
• International Digital Radio Assoc. - IDRA
• NB6Z's Homepage - HF digital mode ham radio
• Packet Radio Home Page - by N2WX of TAPR.
• Radio Amateur Telecommunications Society - Packet Radio.
• Southeastern Emergency Digital Association Networks (SEDAN)
• TORUN Amateur TCP/IP Packet Radio Group/Gateway - Poland

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