Good non Mainstream movie ?

The Endless is new, and a phenomenal mind-bender. Super micro-budget indie with a uniquely fascinating storyline about a UFO death cult. Its a thriller, not a horror, and you've gotta stick with it to get to the good stuff. I was absolutely floored by it.

Also, Coherence. Whether you watch it before or after The Endless, they should be watched together for ultimate brain-twisting potential. Another micro-budget indie about a simple dinner party gone awry while a comet passes by Earth.