I like grenades. Of all kinds. I use them for everything. Attacks, distractions, door-making, 'interrogation' aides, escape hatch 'constructors' (stairs are for pansies, grenades can make nice drop holes in floors), everything. I drop them through vents, toss them out car windows, reverse pickpocket them onto people, pack cheap drones full of them for use as kamikazes. They're easier to conceal, carry, and set up than explosives and can be just as effective. And they're more versatile. You can't load explosives full of aerosolized hallucinogens and toss them at CorpSec.
I also love Bust-A-Moves. Those cheap pieces of crap can be modded in so many useful ways it's disgusting. I've used them as spies, bombs, killbots, distractions, everything.
I also enjoy tossing low-end commlinks around or into weird places to give hackers extra range.