National Front in France has today about the same number of voters that it had already 20 years ago. At the same time, its politics have probably gone left.
Whether UKIP is really "right wing" is somewhat debatable. Eurosceptic, definitely.
Greece? Golden Dawn gets something like 6 %, Syriza gets 36 %. There it looks like extreme left is what people should worry about.
Others?
AfD in Germany: like UKIP, debatable whether it is "right wing", though certainly eurosceptic; anyway, did not exceed the 5% threshold.
Sverigedemokraterna in Sweden: perhaps a reasonable contender, though even there, the actual policies are more like traditional workers parties; the policy target of reducing immigration is unacceptable to other parties who totally refuse to co-operate with SD, thus making it grow.
Vlaams Belang in Belgium: never recovered from forced shutdown of Vlaams Blok over 10 years ago.
FPÖ in Austria: today in same numbers as 20 years ago, though apparently getting more centrist.
The Finns in Finland: mostly socialist and eurosceptic policies, more like Syriza than Golden Dawn.
DPP in Denmark: same numbers as 15 years ago.
Lega Nord in Italy: more a movement of separatism for northern Italy than an actual right-wing movement; popular support is half of what it was 20 years ago.
Overall, if we discuss political extremism, I'd be more worried about rise of far left in Europe, because their violence tends to be "acceptable" while right-wing violence is properly condemned immediately.
The FPÖ seem like some old-school xenophobes and antisemites. Campaigning under creepy slogans like "more strength for our Viennese blood" and publishing cartoons with hook-nosed banker Jews. In what way are they getting more centrist?
Maybe that was a misconception. I can't assess how seriously the party concentrates on those silly blood issues. Anyway, FPÖ's support is not as high now as it was in 1990s.
However, hook-nosed banker Jew cartoons are also spread by the left, even that is no exclusive to the far right.
Regarding old-school antisemites, it is notable that in France, daughter Le Pen is kicking her father out precisely for that.
