When they say “Open Source,” the first associations are usually Richard Stallman and Linus Torvalds. But Open Source didn't start with them. When, in the 1950s, scientists and engineers wrote software, for example, for the IBM 701, they exchanged the results of their labor for free and worked on improving the programs of their colleagues. Then there was no proprietary (closed) software yet, but there were already Open Source projects. This was long before Stallman and Torvalds. There have been many interesting things in the history of Open Source: programs for the "Defense Calculator", the commercialization of UNIX, the letter from Bill Gates, the GNU manifesto, Linux and billions of dollars in purchases of Open Source companies. We tried to understand the history and find out how Open Source began, what events contributed to its development, and why without Open Source IT would not be what it is.
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