"Torvalds" in the above context isn't a possessive noun but rather a descriptive modifier. So no apostrophe is required.
The convention is to use the noun preceding Unix as an adjective. EG: AT&T Unix (not AT&T's Unix), Berkeley Unix (not Berkeley's Unix), SCO Unix (not SCO's Unix), and Wollongong Unix (not Wollongong's Unix).
Sorry English is such a confusing language, especially for you non-native speakers.

Think of it like a color; the word 'red' is a often a noun, but when placed before another noun it turns into an adjective. Because magic.
So any noun (or noun phrase) can be turned to adjective in English? Thanks!
Who's in control of that address? How are the proceeds split up?
Me and fluffypony. The proceeds are split up according to the priority and funds available.
Donations are encouraged. There is a thread to track and encourage donations, perhaps someone has a link to it.
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