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 :)

6 Comments
massi1008@lemmy.world · 5 pts · 140d
What does the distinction even mean? If an american contributes to a Foss project it is all of a sudden no longer European?
Axolotl_cpp@feddit.it · 9 pts · 140d
It's if the project is of european origin or the leading mantainer is european
otto@programming.dev · 3 pts · 140d
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.
Dojan@pawb.social · 2 pts · 140d
What is that preview image?
otto@programming.dev · 3 pts · 140d
It is a screenshot of the filter option that allows to select both "European" and "open source" for people like who want both.
Dojan@pawb.social · 1 pts · 140d
Ah, thank you for taking the time to write that down.
I should've written down my actual thoughts. The preview image didn't look like it was from the site at all given how the search box is breaking the container, and that just looks off. I see now that it's tailwind and indeed from that site. It is a little amusing to me that they're using Tailwind since Tailwind Labs is a U.S. company.