MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
Wetty - Terminal over HTTP and HTTPS.
Console - Console is a Windows console window enhancement.
Shell In A Box - Shell In A Box is a web based AJAX terminal emulator that can export arbitrary command line tools...
Cygwin - Cygwin is a set of tools that provide Linux and POSIX functionality to Windows.
SSHy - SSHy is a HTML5 SSHv2 web client implementing E2E encryption that runs well on modern web browsers.