MyShell  

MyShell is an Open Source web based shell interface Licensed under the GNU GPL, that let's you execute arbiritary shell-commands, edit files and browse the fileystem on your remote web server directly from your web browser. My Shell is programmed in PHP so it doesn't need any Java applet nor direct connection to port 22/23 and is somewhat customizable in order to suit your needs.

Hosting Requirements: PHP 3.0.11+
Price: Free (GPL)

   PhpShell  

PhpShell tries to give you 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.

Price: Free

   Pcom - php commander  

Pcom is a PHP-driven webtelnet, that is a web interface to execute shell commands/external programs on a server.

Price: Free