Control Freak 

A File Manager that incorporates several other applets into one seamless application. You get an Explorer like file manager, a full-featured email client, an FTP client, a zip file manager, a cab file manager, and a powerful file finder.
file management email ftp internet zip cab utility file manager web html file

Com 

Com 7.1f Supports ANSI, VT52, VT100, VT220 and DOORWAY emulations. File transfer protocols: Xmodem, Ymodem, Zmodem, Kermit, Ascii, and Pure Binary. Macros, powerful scripting language with script learning ability. Auto connection, Command line parame
terminal emulator serial telnet vt100 vt52 vt220 xmodem ymodem zmodem transfer script ansi doorway

Socket Workbench 

Socket Workbench is the definitive tool for analysing socket communications that underlie the Internet and several types of inter-process communication.
sockets socket workbench udp socket tcp udp sockets tcp sockets packet sniffing socket protocols packet sniffer protocol analyzer protocol analyser tcp/ip networking sockets