Korean War site:
http://www.koreanwaronline.com/arms/arms.htm
Has weaponry for both sides. A lot of this equipment is described in the T2K Infantry Weapons and Heavy Weapons books.
WW2... LOTS of possible sides, and lots of possible equipment. And, again, lots of the weapons are available in the T2K Infantry Weapons Guides.
Other equipment, you can find descriptions of a lot of items (search for WW2 Equipment Infantry <nation>)
I'd suggest limiting to an area, and limit yourself to those combatants. (For example "Stalingrad" and look for German and Russian equipment, or "Philippines" and look for re-War US and Japanese equipment...
Uncle Ted