Great overview from @SpainChillihead
I agree completely.
I can add my own experience from european seed shops:
Kind of like the Apple of seedshops, the seeds are expensive but the website is great, with good descriptions and pictures. Be aware I have sometimes seen common varieties renamed on the site for an increased price. Nevertheless I have had great plants from this site and will probably buy from them again, they get new varieties very often, and if you are subscribed to the newsletter, you get access to a special VIP section with "rare" seeds. Which I find a little stupid because those seeds you can easily get elsewhere. They also include freebies so in a way that makes the higher prices a little easier to swallow.
Website is not as "nice" (own opinion) as Fatalii, but you can sort seeds by species and there's a HUGE wild category. The prices are the best across all sites I have come across. They also just got new seeds recently. I just bought from them recently and will probably again
So the reason I mention this site, as I haven't bought from them yet, is because another danish seedshop I have used very often, gets their seeds from this site. So in a way I have bought from them indirectly. Huge selection and I will probably also buy from them in the future.
Not an european shop, but I have bought from them countless times, and they always top off with as many free seed packs as you order. This makes the just slightly higher shipping price very okay. Never had an issue with them, and when it comes to gnarly peppers or new crazy crosses, this is my go-to. Only downside, they specialize in Chinense peppers, but that's only a downside if you don't like those.
The hippie seed company
Australian seed shop but will deliver to Europe. Great site as well. The shipping from australia to Northern Europe was about a month so order in good time. They even included a handwritten note in my native language saying thanks for the order. That is something im just a sucker for and I will always recommend them because of this haha. That said, I have only ordered one seedpack from them, a murupi amarela which ended up being a cross as they where bright yellow (This one is supposed to be white), I wrote to them about it, but never heard from them. Still I think they are passionate about their seedshop.
Chilifrø, tomatfrø, forspiring, vækstlys, selvvandingspotter og systemer og meget mere.
I mentioned above in the pepperseeds.eu review that A danish shop got some of their seed supply from them. This is the danish vendor. Unfortunately the site is not in English, and I have no experience if they deliver outside of Denmark. Just wanted to mention them as this was the site I bought my first pepper seeds from and I still buy from them from time to time.
Supposedly one of the best in getting true seeds as they isolate their plants. The prices do reflect this..
I have never bought from them as their website don't let me sort according to pepper species, but only according to "heat". That's the one reason I have never bought from them, but they also deliver to Europe.
Hope that helps
EDIT: I just want to make it clear that I have no affiliation to any of these sites, and all of the above reflect my own experiences.