It is a rigging knife. The pointed thing is called a Marlin Spike and is used when splicing ropes to open the gap under a strand. The blade is called a sheepsfoot and has a blunt end.
Congratulations kjsimons! Do you have an object to post?
well, number three is obviously designed to cut to a limited depth. It could be bandages, insulation, documents but there is something below that that should not be cut.