In addition to all of their other great 15mm miniatures, Blue Moon Manufacturing has a line of pirates. There are loads of pirates, always utile civilians, and even some reasonably affordable resin ships.
The current powerhouse in 15mm miniatures would have to be Blue Moon Manufacturing. They have a small but evocative horror line which includes zombies (of course), but also werewolves & vampires, wolves, and a Jack the Ripper vignette featuring a…
Blue Moon Manufacturing has released a much-anticipated line of 15mm figures (really 18mm these days) for exploring Deepest, Darkest Africa. The line currently comprises 12 tribes of natives (including pygmies), askaris, porters (with ivory, nicely complementing the Irregular bearers who have…
Sparks: Sunburned and Rusty from Cumberland Games and Diversions. Sparks are paper miniatures rendered as a font so that you can print them out at any size.
Vulture Gulch Western Denizens from Microtactix are cardstock figures available for immediate download from RPG Now.
Peter Pig makes the original line of 15mm cowboys. Available expeditiously in the US from Brookhurst Hobbies.
Minifigs has a 15mm line called Best of the West with lots of indians and pret’ near everyone is available both mounted and dismounted.
Irregular Miniatures has a line of American Indians figures, which includes US Cavalry troopers and an odd cowboy or settler or two. Also check the American Civil War and Colonials lines for interesting characters.
Freikorp 15s, now owned by QRF Models, have the Yellow Ribbon Range which features indians, cavalry, settlers, buffalo, and a stagecoach to chase.