AdventNet Simulation Toolkit 

Creates a virtual lab with 50,000+ devices for testing, training and demos. Support for SNMP, TL1, TFTP, FTP, Telnet and IOS devices with Traps & Informs, Autonomous Msg, Jython script, agent management via RMI , PDU Scrambler and Customization.
network simulator network simulation snmp agent simulator agent simulator snmp simulator

febooti Command line email 

Utility to send email from command prompt; send attached files, plain text or HTML (with embedded pictures). Supported - TO, CC (Carbon Copy), BCC (Blind Carbon Copy), alternate text for email programs that do not support HTML messages, text encoding
command line email command line mail command line mailer command line e-mailer command line smtp scheduled email send email command line html email html mail automatically send e mail

SSHBlackbox (.NET) 

SSHBlackbox.NET is a comprehensive collection of managed components that add client-side and server-side support for SSH (Secure Shell) to your .NET Framework applications.
dotnet net .net ssh secure shell protocol control component

Remote Helpdesk 

Provide support to all your customers by remote control. Remote Helpdesk can be started from a shortcut to a Web or file server and runs without installation. A single license includes unlimited clients.
remote helpdesk remote helpdesk support remote control pc remote control remote control software pc anywhere vnc terminal server transfer files

AbsoluteTelnet 

Fast 32-bit telnet with SSH1, SSH2, TAPI Dialup and direct COM port access. Solid emulation gives AbsoluteTelnet the edge, along with SOCKS Proxy, session logging, Color/Font settings, port forwarding, X11 forwarding, and a host of terminal options.
ssh ssh1 ssh2 telnet ssh client utf8 telnet client x11 xterm free vt220 terminal emulator ssh1 client

ircII EPIC4 For Windows 

A port of the popular IRC client to Windows. Includes an easy to use GUI front end and is fast and secure. Most major ircII scripts for the UNIX/Linux version can be used with this client easily. Includes full documentation.
irc ircii epic chat unix linux windows cygwin hybrid dalnet efnet