PHP Shell is basically a shell wrapped in a PHP script. It's a tool you can use to execute commands on your remote webserver, even if you can't have normal telnet-access. There are certain limits, but you get as close as you can get to having a telnet-connection to your webserver in a webpage.

MyShell is a web based shell interface that lets you execute shell-commands, browse the filesystem and edit files on your remote webserver directly from your web browser. It has built-in password protection, directory protection, and command filter. <b>1.1.0 update:</b> This version includes an integrated file editor wich makes install, untar and edit config files a breeze.

jTERM is an online terminal written in PHP. You can issue system commands from the web. Please note that this is a dangerous tool. Please do not use it if you can't provide proper security access regulations.

Pcom is a PHP-driven webtelnet, that is a web interface to execute shell commands/external programs on a server without telnet access. It's useful when you need to perform shell actions nut you don't have access to a shell on the server. It can handle non-interactive sessions and interactive programs in background.