Nanoblade is basically a crossbow, plus the charge up is an explosive. Something I think people might enjoy doing is bypassing door hacks by using a charged nanoblade instead.
Focus is combat focused but you could, for instance, turn that on and then tranquilize everyone in the room fairly quickly.
Tesla is a stun user's dream because you can auto-target, Panzer Dragoon style, and hit up to four targets (if upgraded). (I know the game says "hostile" before they go down but it might be just a visual bug? Have to check.) Tesla also can target robots/camera/etc.
Peps has no ammo cost and does knockdowns so you don't have to worry about killing anyone (unless they fall off a ledge?) Also bizarrely is really useful to shoot in a small room or apartment, you can clear away boxes and look for whatever might be hidden underneath.