m23 is a free software distribution system licensed under the GPL, that installs and administrates clients with Debian, Ubuntu, Kubuntu. m23 is controlled via webbrowser. The installation of a new m23 client is done in only three steps and the integration of existing clients is possible, too. Group functions and mass tools make managing a vast number of clients comfortable. Client backup and server backup are included to avoid data loss. With the integrated virtualisation solution, m23 can create and manage virtual m23 clients, that are run on real m23 servers and m23 clients. Scripts and software packages (for installation on the clients) are created directly from the m23 webinterface.