Shell In A Box - Shell In A Box is a web based AJAX terminal emulator that can export arbitrary command line tools...
PuTTY - Popular free terminal application. Mostly used as an SSH client.
Bastillion - Bastillion is an open-source web-based SSH console that centrally manages administrative access to systems.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
Wetty - Terminal over HTTP and HTTPS.
iTerm2 - A terminal emulator for macOS that does amazing things.