Companies listed here have done VFX work for multiple movies of at least some substance in the past ~3 years, sorted roughly by the percentage of those movies out of all their projects (and countries sorted by the average percentage among their studios). The sorting is obviously somewhat subjective but I felt probably still more helpful than just alphabetical.
The Post Republic
Frankfurt, Stuttgart, Berlin, Munich, Hamburg
Mostly commercials, occassional artsy/indie features:
The Chimney Pot
Pictorion Das Werk
I'd really love to compile a list of companies that do that...
What I consider artsy/indie (or at least "... with some depth" - doesn't have to be truly artsy or indie. Just no mundane blockbusters... even though I of course wouldn't mind working on that once in a while. Still interesting from a strictly technical point of view...) is best exemplified by some companies and projects I am already aware of.
The only Canadian company I know about so far - Intelligent Creatures. With e.g.: Everybody's Fine, Traitor, The Number 23, Babel, The Fountain, Stay, Stranger Than Fiction, etc.
European examples: Melancholia, Let The Right One In, Max Manus, Martyrs, etc. (which I realize had effects done largely by companies that on average appear to do more commercials than feature film - Ghost VFX, Fido, Filmgate, Buzz Image Group)
As you can see, that's quite the small list. I'm sure there are more. I realize many of them are probably located in California but there must be more outside of the US too.