The first few pics are variations of traditional Kukuri and “tracker” style knives. Both of the mentioned patterns are extremely popular for good reasons. The Kukruri is a very capable tool in the right hands, blends knife , machete and hatchet into a single tool. The Tracker style knife has its own cult following, another very capable tool in experienced hands. The last pics are little more than novelty items mass produced with poor materials.
The first 3 pics show real knives that actually function.
Pic one is a Kukrui variant that looks well built - no idea who the maker is though ( Himalayan imports ? )
Pic 2 is made by Tops - decent camp knife in 1095 with excellent heat treatment
Pic 3 is a bark river tracker interpretation. I’ll let other members comment on that maker.
These style knives can carve, chop and build shelters pretty easily. Excellent design if you plan on encountering problems that could be solved by building shelter, making fires or possibly defending yourself. Popular for many reasons. The saw back on the bark river is for notching more than sawing. Those knives can chop pretty well, make curls for fire prep etc - usually paired with a smaller knife for detail work.
Pics 4 and on - low quality manufacturing..
If you are looking for knives similar to the ones pictured:
David Beck makes the quintessential tracker
Ed Martin made a few
Scott Gossman makes the Kubo and Kubo 2
Bill Siegle Makes the best Bolo made ( opinion )
Tops makes some unique styles
Wenger blades makes excellent trackers ( and boker makes budget versions as well ).
Check out the makers market here while you’re at it.