SV2AGW has developed the AGW Packet Engine - this allows users to receive and transmit packet signals via their sound cards in their PCs thereby using packet without a TNC.
Everything you need to know to setup and use AGWPE for packet radio. AGWPE is a free software program for ham radio packet using a PC soundcard, developed by SV2AGW. This site walks ham radio operators through the cables, configurations, and roadblocks of setting up this program to work with your radio.