There are several weapons you can find along the way or pick up when your enemies drop them.

Brass Knuckles	Your punches will be more powerful.
Chain	A long range weapon.
Crate	It’s a bit slow but deals high damage.
Stick	Good for close range attacks.
Lead Pipe	Like the Stick, but more powerful.
Rock	It adds power to your close range attacks.
Tyre	It’s slower than the Crate, but deals more damage. If you throw it, it bounces off walls damaging everything in its path. You can also jump on it and ride it.
Trash Can	It’s the most powerful weapon, but also the slowest.