More comprehensive Unix family genealogy (see how much you know)

This is a simplified Unix family genealogy. In the words of the author of the figure, a considerable number of Unix-derived operating systems are not included. In the real world, the number of Unix systems may be more than 10 times that listed on this figure. This is really just the tip of the iceberg, or even the penguin standing above.

From this figure, we can also see why foreign countries have certain accomplishments in the OS field, because they have had such a large amount of technical accumulation in decades, it is also the accumulation of system talents. Only a hundred schools of contention can be filled with flowers. Learning from history, we still have to go a long way on the road to OS.

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All images are copyrighted. From: http://www.levenez.com/unix/