H2O paddles - made in Canada, hard to find in the US. Founded about 10-12 years ago by the same guy who started Core paddles, and before that WaterStick paddles. He has real innovative ideas for paddles, though quality (shaft leakage) always seems to be the big question. The rubberized grips on the paddles are great and the blades are bomber. I think they're a bit overpriced, and shipping from the factory in Canada to the US isn't cheap. H2O Paddles | Whitewater Paddles
Seven2/Soul Waterman paddles - Seven2 paddles came out in the late 90's and were very innovative though quality was a big question and they went out of business in early 2000's. Soul Waterman recently re-introduced a Seven2 like paddle that looks intriguing, though it seems to be consistently out of stock on their website: Rapier Kayak Paddle – Soul Waterman
TyWarp - interesting German paddles, I've seen them over the years. Picked up a new one from Craigslist recently for my son and I used it on two runs. It's a decent paddle but doesn't offer anything better than/real different from Werner/AT. TyWarp
Even though Werner is considered the gold standard in paddles, I wish they'd be more innovative, especially with the grips on the paddles.