I dig a little bit of everything all the time, but I think I can still maintain a small list. Mostly I stick with neo-folk and country. Vàli, Forseti, Fire + Ice, Puissance, Angels of Light for that folk hunger. Hank Williams Sr., Those Poor Bastards, .357 String Band, Sons of Perdition for some good ole fashioned doomsday country. There's never been a more tortured voice recorded than the elder Hank's. Then you have the best non-metal band ever conceived, SWANS. Michael Gira can do no wrong.
Have you heard "Theory of Machines" by Ben Frost? I'm not sure of the right way to describe it. It's kinda electronic, kinda industrial. Wikipedia, for what it's worth, describes it as a combination of minimalism, black metal, noise, and post-punk. Anyway there's a song on there called "We Love You Michael Gira"
Hardstyle, Gabber, Industrial/HBM: Blutnoium Boy Mental Theo BladeMasterz Psyclon Nine Hardwire Turmion Kätilöt Brennan Heart The Kovenant (Previously a Melodic BM band) Zanza Labs Major Bryce Samael DJ Likferd DJ Venom I like alot of random stuff that isn't metal, elitism is just pointless self deprivation , No thank you.
Lately I've been listening to a lot of Gutter Punk. I find it offers a good contrast to the individualist message of most Heavy Metal. Leftover Crack is by far the best band to exemplify this mindset.
Neo-folk, celtic, and classical only. For example, Sol Invictus, Neun Welten, Faun, Mediæval Bæbes, Lorena McKennitt, Bach, Mozart, Sibelius, etc.
Besides metal I mainly like hard rock and industrial with the occasional neo-folk band thrown in for good measure. Anyway here's a few non-metal bands I find enjoyable. Fleet Foxes (neo-folk), Mattafix (reggae), Diary of Dreams (darkwave/industrial), Alice in Chains (grunge), Antimatter (ambient/melancholy rock), Pain (Peter Tagtgren's other band kind of pop influenced hard rock/industrial pretty interesting stuff!), Thieves & Liars (80's influenced rock), Kings of Leon (hard rock), Poor Man's Riches (Christian hard rock), Rotterdam Terror Corps (gabber), Dead Can Dance (experimental folk) and of course the classics like Nazareth, Bob Dylan, Jimi Hendrix, and Steely Dan. Joel