Since I was just blabbing about Alkemia, I am going to add her to this list, although in the grand scheme of things, I wouldn't call her shop "little known" - more like, I just don't see her talked about a lot? She does scents in a more traditional manner - a lot of what I would consider to be very traditional "oriental" scents, and a lot of scents that I think harken back to times before modern perfumery, with heavy notes like incense and musks.
That's not the full catalog though. I've talked a a lot about how much I love Moroccan Tea, and there are more gourmand scents like Au Lait, and Prairie 66 which is like - THE scent if you love that fresh, outdoor, summer skies and grasses scent.
I really wish there were more fans here! Her shop has been around for ages, so going into forums with a lot of Alkemia fans is a bit terrifying, not going to lie - they are very, very serious about the scents.