Kukri.
Jagdmesser.
Big ridiculous 'survival' knife.
Swiss Army knife.
Leatherman-type multitool.
RM42 fighting knife.

Based on the Fairbairn–Sykes fighting knife and the Gerber Mark II.
Missing tech.
Derp.
Tweak.
Fix.
Merge pull request #8932 from Rivet-the-Zombie/what's-all-this-talk-about-knives

Knife diversity PR!