After comparing several of these directories, seems https://euro-stack.com/ is the most comprehensive. I also like that it allows to filter by both being European and open source.
It is also made by the same people who run https://eurostack.eu/ and who got a lot of visibility delivering the https://euro-stackletter.eu/ letter to President Von der Leyen a year ago. Hopefully they settle soon on what is their primary domain :)
Is Linux from Finland or from the USA? If someting is open source and has a global contributor base and no single entity can subvert it, then I don’t really think the country matters. But it there is one entity that controls it, then it matters where it is from and what jurisdiction and what policies apply on it.