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1 SGI funding and engineering advice to open source developers at Precision Insight, who integrated GLX with XFree86 and with the Mesa project (an open source software implementation of the OpenGL API) in 1998 and 1999.
Open source is a kind of free software. It is different from other software because the source code is available to everyone. The source code is a set of instructions for the computer, written in a programming language. Anyone can see how the source code works and can change it if they want to make it work differently. The opposite of open source is closed source. Closed source software is not available to everyone. Open source has a lot in common with free software but each has its own focus and goals. Open source and free software have been around for decades.