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Netcells servers run on Open Source software: Linux, Apache, MySQL and PHP.
We use open source framework CodeIgniter.
Other than that, Netcells.net, other sites of our network, as well as the Netcells User Zone (NUZ) use our own programming code, which is not Open Source.
The purpose of that code is to provide the integrated range of functions for both our network and the individual user sites, with a single log-in, one interface, upgrades and ongoing support.

We also use commercial software, such as cPanel, for managing external user sites hosted on our servers.