If you want really obscure, here are a few more US companies for you:
1. California Inflatables — made boats for the military in the 90's. The most common was the 3-man recon raft that was about 9' long with 2 main chambers, 1 thwart and bucket floor. Relatively light at about 40# for just the bare boat. It looked like a black mini-me about 20 years before the MiniMe existed. The other boat they made was a 7-man landing craft—a Zodiac-type boat. About 14' long, hard transom, inflatable I-beam floor, 4 main chambers IIRC. Both boats were a mix of heat-welded and glued and pretty sure made from Urethane (they had the hard glossy look of urethane). They also had weird anodized aluminum liferaft-type valves that would only stay open if the proper fill fitting was attached so they included a special "deflate fitting" for that purpose. The boats pretty much delaminated and fell apart at the seams after 10-years of use, although the 3-man recon boat I had was pretty cool. I would have kept it if it was a bailer. Made a great outdoor bath for the dogs though!
2. X-Tyal Corp, Hudson, NY — Made various vulcanized neoprene rafts for the military, similar to BFG, Goodrich, Uniroyal, Rubber Crafters, etc. One was their version of the 3-man recon raft. Much narrower than the later Calif Inflatables version, 4 main chambers, inflatable I-beam floor (no bailing holes though) and no thwarts. It had a unique "keel" protrusion from the I-beam floor on the underside. The neoprene was pretty thin so the weight wasn't bad...around 35-50# IIRC. They also made a version of the 15-man assault (landing) raft: a 15' long Zodiac-type raft with wood transom. The unique thing about their version was the inflatable DROP STITCH floor that was 2 layers thick. Basically one main drop stitch floor covered bow to stern, and a second level was constructed above that from 1/3 back to stern. The boat had 8 chambers— 5 main tube, 1 perimeter splash tube, plus the 2 floor chambers. It was also ridiculously heavy...nearly 300#. Their boats all used traditional metal military valves.
3. Hunter Outdoor Products. Inc, New York — made a neoprene 3-man recon boat identical to the X-Tyal version described above. The one I came across was made in 1971 and was in great shape for as old as it was. Not much more to say about them...never could find any info on them, but it was a cool little lake fishing boat. Kinda of an early pack raft.