Brute Chant - Killer Each of You 2002. Latvian death metal currently sitting at 42 ratings. Don't really know who to compare this to, usually gets tagged as avant-garde and technical, I guess they fit but in a not-so-obvious way like with other bands. Definitely feels like the product of a post-USSR scene, after the country opens up and the kids absorb everything that was new into these bizarre contradictory musical ideas.
Hardware - Hardware 1990/91. Mexican "experimental" death metal (+ some dark ambient) with only 22 ratings. Pretty amazing thing to come out of a place like Mexico that is usually known for its less ambitious and more raw metal, kind of like Mordeth coming out of a place like Brazil. This demo fucking rules, it's a shame they were never able to fully realise their potential.
Nomicon - Tri-Angle 1991/92. Screeching Finnish technical death metal, unfortunately the demo is less than 10 minutes long so it feels like it's over as fast as it started, but it does a lot in that time and I love it. Has 35 ratings right now. I think they became a black metal band later on, never bothered to check it out.
(Only the first 20 minutes is this EP, the rest is compilation material.)
Agretator - Distorted Logic 1996. Dropping a good amount of the death metal from their album 2 years prior and leaning heavily towards more dexterous tech-prog-thrash, really good shit. This band split a few years later and basically became Darkane. Only 20 ratings.