Wow, pretty wild to see thread like this get such a response, this was not the case some time ago. Ok I'm gonna throw a few to the pile.
First - Justin Broadrick (of Godflesh fame) with his project Jesu. Atmospheric post metal/shoegaze gem.
Second - Cloudkicker, one man instrumental project from Columbus Oh. With strongish djent influences on early stuff, so think meshuggah but more melodic, later stuff a bit different.
These are relatively not well known but with quite a following within the people in the know.

