I made a list on rate your music. Check it out!
http://rateyourmusic.com/list/Flying_Witch/black_metal_bands_that_deserve_more_attention
I will edit and add more bands that are not in the list. Wait!
EDIT Alphabetically
Aderlating (Dark Ambient/Drone/Noise/Experimental Black Metal)
Ahulabrum (Experimental/Raw Black Metal/Noise)
An Autumn for Crippled Children (Atmospheric/Depressive Black/Doom/Experimental Metal)
Ave Maria (Experimental Black Metal)
Bestia Arcana (Black Metal/Ritual Ambient)
Black Table (Atmospheric Post-Black Metal)
Bosse-de-Nage (Atmospheric/Depressive Black Metal/Post-Rock)
A Cackle or a Coughing Fit (Avant-Garde/Post-Black Metal)
Closed Room (Black Metal influenced Experimental Trip-Hop/Shoegaze/Ambient)
Cold Empty Universe (Ambient/Depressive Suicidal Black Metal)
Cultus Sabbati (Experimental Black Metal/Dark Ambient)
Emit (Black Metal/Dark Ambient)
Gnaw Their Tongues (Black Metal/Dark Ambient/Experimental)
Locrian (Drone/Noise/Experimental/Black Metal/Ambient )
The Ruins of Beverast (Atmospheric Black Metal/Dark Ambient)
Seirom (Experimental Black Metal/Ambient)
Trancelike Void (Depressive Suicidal Black Metal/Dark Ambient)
(V.E.G.A.) (Industrial/Black Metal/Dark Ambient)
Woods of Infinity (Depressive Suicidal Black Metal)
Xothist (Post-Black Metal/Dark Ambient)