Core Systems, Inc.
TCP/IP stack for Windows, Winsock 1.1 compliance. PPP, SLIP, CSLIP ready for internet hookup. Internet gateway capability, with custom filters

Dart Communications
Provides Winsock compliant TCP/IP components for many development environments.FTP, SMTP, POP3, TELNET, TCP, UDP, TFTP, SNMP and VT220 libraries for C/C++, VB and Delphi.

Distinct Corporation
Provides TCP/IP products for Windows like TCP/IP Tools, TCP/IP Software Development Kits, and TCP/IP Protocol Stack.

Dudas Software
TCP/IP programming tools and controls for developing client and server software for windows.

FTP Software Inc.
Provides system integration, network design and performance, and network management, specialising in TCP/IP integration and LAN networking technologies.

IMM Studios Ltd.
CGI scripting, HTML, SQL Database Linking to WWW, TCPIP and Networking setup. Customised software design, 2D and 3D graphics and Interactive kiosk design.

Intellectics
TCP/IP software for mainly larger environments.

Seattle Lab, Inc.
Develops networking and TCP/IP utilities for Windows NT.

Stardust Technologies
Stardust delivers comprehensive technology services to developers of TCP/IP-based Windows software for the Internet and Intranet.