Also, keep an eye on Archon studios.
That. Their stuff is good quality at excellent prices, especially the large dragon kits.
If we're down to discussing individual companies instead of industry trends, some others particularly worthy of mention include:
Northstar Military Figures - Despite the name, they offer a wide mix of figs rather than just wargaming minis. They're doing particularly well with their modular hard plastic kits for Frostgrave/Stargrave/Ghost Archipelago, which just keep getting better as they refine their skills. I would put them far ahead of even the best GW plastics in terms of versatility and cost, and if you haven't tried building and painting a box or two you don't know what you're missing. And those are just the tip of the iceberg for a large and varied catalog that has something for just about anyone, including a great array of reasonably-priced metals and resins for those who prefer the heft. I'd credit a lot of their success to their strong customer outreach, with regular newsletter updates full of new releases and "Nickstarter" discount preorder deals.
Alternative Armies - These folks are another company with a huge catalog and weirdly little market presence in the US. In addition to some excellent and ever-growing 28mm, 15mm and 6mm ranges for multiple genres, they're steadily bringing back vintage 25-28mm sculpts from the 70s and 80s that have been hard to get for decades now. They run modest ~20% sales on a regular basis (one concludes today, for ex) that make the massive bite of overseas shipping for non-UK gamers a fair bit less painful.
Brigade Models - A much smaller operation in the classic "two guys casting in a warehouse" style, they still have a quite large range of primarily 15mm, 6mm, and aeronef/starship minis, including licensed Hammer's Slammers ranges. Their smaller-scale resin terrain ranges are also very nice, and they dabble a bit in some rather quirky fantasy and historicals. They've been very proactive about retiring and replacing older sculpts and shifted to 3D printed masters earlier than most small casters. I'll be a little surprised if they don't wind up transitioning to selling printed figs and STLs eventually. They're also probably the most likely company to wind up with the massive
Ground Zero Games catalog if Jon Tuffley ever retires, as the two businesses have been on good terms for years and they're fairly close geographically. I like Brigade (and GZG) a lot for demonstrating than there's still room for little "garage shop casters" in the modern industry.