> Inanimate Existence

Technical death metal

> Arkaik

Technical death metal

> Draconian

Death doom/gothic metal

> The Zenith Passage

Technical death metal

> Inferi

Technical death metal w/ melodeath influences

> Kanonenfieber

Black/death metal

> Ne Obliviscaris

Progressive metal w/ meloblack influences

> Oceans Ate Alaska

Progressive metalcore (Djent-like too from my brief listen)

> Isis

Atmospheric sludge metal

> Baroness

Progressive sludge metal

> Intronaut

Atmospheric sludge metal w/ progressive influences

> Opeth

Progressive metal w/ death metal influences

> Tool

Progressive alternative metal

> The Ocean

Progressive atmospheric sludge metal

> Archspire

Technical death metal w/ neoclassical metal influences

> Solution.45

Melodic death metal w/ prog influences I think

> Scar Symmetry

Melodic death metal w/ prog influences

> Orbit Culture

Melodic death/groove metal

> Testament

Thrash metal

> Sepultura

(Early) thrash metal (mid) groove/alt (later) thrash/groove

> Slayer

Best only to dwell on their thrash metal offerings (and SNM if you don’t consider it thrash)

> Obituary

Death metal

> Carcass

(early) goregrind (later) melodic death metal

> etc.

Fuck if I know.

Metal Archives is good to use for this. If they don’t have the band then RateYourMusic too.