Here are the ones I know off:
ROG/Italeri - 1/9 - mostly WWII
Tamiya/Italeri/etc - 1/35 - WWII
Imai(RIP) 1/12 - Mostly post-WWII Models
Tamiya 1/6 A few mostly FLH variants
There was another one of a 1912(??) Harley
Biggest range of HD kits was IMAI, but they are gone now.