(The search engine functionality is down for unscheduled maintenance but will return by June 30, 2009.)

• APRS SIG Mailing List
  The official mailing list for APRS discussion. Search and browse the archives.
• APRS Special Interest Group at TAPR
  The APRS Special Interest Group hosted by Tucson Amateur Packet Radio Corp.
• APRSQuery
  An easy interface to search the findU and APRSWorld databases.
• APRS France
  A huge site of APRS information and discussion in French.

• aprsworld-to-XML Interface
  Get data from aprsworld.net in XML format.
• APRS Variable Replacement Script
  Paste some variables into your web page on a server anywhere, send the URL of that page to this script, and the variables are converted to data.