Lets see what we have in U4E...

Quantum Singularity Generator - basically creates a small blackhole; some cool effects can be made with this as it sucks in all nearby objects; also, if you create multiple singularities and enter one, you can come out of another
Fleshbomb Rifle - when a person is hit by this, they basically run around for a while with their sight turning red and then die in a big high-radius explosion a bit later; very fun to use
Blow-up doll - everyone can guess what this does; just runs around saying "mama" until someone gets near it, at which point it explodes in a mini-nuke
Airblast - basically an aircraft propellor, you can blow stuff away, suck people in, and fly around
Shrinker - can shrink or enlarge target ; if enlarged, target gets really fat and then explodes; if shrunk, target becomes really small and gets 2% of its original health (can be easily run over)
Spider bomb - crawls around map and searches for targets; when target is found, it just moves near it and blows up
There is all kinds of other stuff in there as well; these are the weapons I can remember at the moment.