ISPConfig 3 is the next generation of the ISPConfig control panel, rewritten from scratch to support virtual users and multiple servers. ISPConfig 3 can not be used to Update a ISPConfig 2 installation.
Download ISPConfig 188.8.131.52 [Download] Info
ISPConfig 3 Manual
On more then 373 pages, it covers the concept behind ISPConfig (admin, resellers, clients), explains how to install and update ISPConfig 3, includes a reference for all forms and form fields in ISPConfig together with examples of valid inputs, and provides tutorials for the most common tasks in ISPConfig 3. It also lines out how to make your server more secure and comes with a troubleshooting section at the end.
Download ISPConfig 3 Manual [Download]
ISPConfig 3 extensions and plugins
ISPConfig 3 billing module [Info and online demo]
ISPConfig 3 Monitor App [Info and screenshots]
ISPConfig 3 mailuser interface for roundcube [Info] [project page]
ISPConfig 3 mailuser interface for squirrelmail [Info] [project page]