Canadian Black List?

Q. Is there anything like a Canadian "Black List" of the best unproduced screenplays?

Not that I'm aware of; although the WGC does from time to time award the Jim Burt Prize to the best unproduced screenplay that hasn't been optioned.

I would call development people at the finer production houses around town and ask what scripts they loved that they were unable to option, say because the material didn't fit their mandate, or their boss didn't love it. They'd probably be happy to tell you. No one wants to see a good script go unmade.