Moiphp.com, Moscow, Russia

We use Debian to develop new sites with php, html5, and javascript for our clients. All of our sites are tested in Linux infrastructure.

We have 10 workstations which run Debian for office use, 11 dedicated servers and 4 virtual servers which provide hosting for sites, infrastructure for developers, and jabber, DNS, FTP and VoIP services.

We choose Debian as our main OS because it's a stable and easy to support system.