There have to be boomerangs--Batman uses them, and at least two villains have them as their signature weapons. They have endless possibilities for customization, and they're relatively lightweight so they can be easily carried.
Directed energy weapons--lasers, heat rays, freeze rays, stun rays, paralysis rays, you name it. In a hero's hands they're most likely to be non-lethal variants, and if they do possess lethal potential--such as disintegrator rays--they are never used against living targets.