Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
Wetty - Terminal over HTTP and HTTPS.
Shell In A Box - Shell In A Box is a web based AJAX terminal emulator that can export arbitrary command line tools...
Bastillion - Bastillion is an open-source web-based SSH console that centrally manages administrative access to systems.
Phusion Passenger - Phusion Passenger is a multi-language (Ruby, Python, Node) web & app server which can integrate into Apache and Nginx
TinyShell - TinyShell is an open source UNIX backdoor.