1. Centro de Comunicación Científica, Universidad de Buenos Aires, Argentina 2. educational 3. http://www.ccc.uba.ar/ 4. We are UBA's NOC. We use the 'stable' brach of Debian GNU/Linux in a few workstations and almost all of our servers. We also have a Debian mirror. We chose Debian because it is stable, simple and fast to install and to use, and because it is Free Software. Regards, MLM