Internet Security, Connectivity, and Remote Access Products from Sonic including the Bandit, a LAN-to-dialup hub. http://www.sonicsys.com/

DataCore - Software and Networking Solutions including PPP software for NextStep http://www.datacore.ch/products_english.html

Klos Technologies, Inc. Klos Technologies specializes in protocol analyzer tools and network protocol stack (PPP, TCP/IP, IPX) development. http://www.klos.com

NTS Develops TCP/IP infrastructure products to simplify administration and improve the reliability and security of intranets. Product lines include Shadow IP Services to simplify IP address management, and TunnelBuilder software for secure Intranet access. http://www.NTS.com

The Mac Orchard - Connectivity Applications TCPSerial http://www.macorchard.com/connect.html

The Direct Connection Driver, documentation, and guides for null-modem PPP connectivity. http://www.kevin-wells.com/net/