Ipswitch

Ipswitch, Inc. was founded in 1991 and developed a family of TCP/IP products for a range of PC platforms:
 * Acadia/VxD for Windows
 * Piper/IP for DOS and Windows
 * Vantage/IP for OS/2
 * Catipult Netware to TCP/IP gateway
 * WS_FTP Pro (1994)
 * IMail electronic mail for Windows
 * INews network news for Windows

Links

 * https://www.ipswitch.com