TAPR is an international non-profit educational research and development organization focused on the issues of amateur radio wireless digital communications.
Information resource for S5-PSK 1.2 Mbps BPSK packet radio station for 23 and 13cm (and 9cm), S5-70WB FM packet radio station for 70cm band and 19k2 to 76k8 bps, S5-PCC - packet communication card.
Karl Norton provides information about JNOS and AX25 utilities for Packet Radio on Linux. The site also covers the topics of homebrew, TCM3105, net105, and J-Pole antennas.