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Linux is not a programme it's an operating system kernel and a philosophy.
How Linux is built

Linux is a free Unix-type operating system originally created by Linus Torvalds with the assistance of developers around the world. Developed under the GNU General Public License, the source code for Linux is freely available to everyone.

Linux is the operating system installed on all of the worlds 500 most powerful computers
Operating system   Computers   % count
Mac OSX00%
Other O.S.00%

Linux has 100 per cent of the supercomputer market, 82 per cent of the smartphone market (Android), 90 per cent of mainframe customers, 90 per cent of the public cloud, 62 per cent of embedded systems, and is the number one internet client.

Google uses a internally.
Germany has announced that 560,000 students in 33 universities are migrating to Linux.
IBM does extensive development work for Linux and also uses it on desktops and servers internally.
DreamWorks Animation has been using Linux since 2001, and has more than 1,000 Linux desktops and 3,000 Linux servers.
Wikipedia moved to running its servers on Ubuntu Linux in late 2008.
NASA has switched the International Space Station laptops to Debian Linux.
Both CERN and Fermilab use Scientific Linux in all their work; this includes running the Large Hadron Collider or the Dark Energy Camera or the 20,000 internal servers of CERN.
Brazil has 35 million students in over 50,000 schools using computers all running Linux

I work on PCs running a custom Linux based on XUbuntu using the xfce desktop.

If you would like to know more about this version - click here

The programmes used for this site are Bluefish for the HTML and Gimp for the imaging. As with most Linux software both are free programmes distributed under the OSS (Open Source Software) program covered by the GPL license. That is a saving for me of £1000 over the cost of programmes like Photoshop and Dreamweaver. Which means my work costs you less.