Wetty - Terminal over HTTP and HTTPS.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
Shell In A Box - Shell In A Box is a web based AJAX terminal emulator that can export arbitrary command line tools...
Console - Console is a Windows console window enhancement.
Bastillion - Bastillion is an open-source web-based SSH console that centrally manages administrative access to systems.
Cygwin - Cygwin is a set of tools that provide Linux and POSIX functionality to Windows.