I'm pretty sure you move the plates, and put a swiss bar there. So you can do full ROM crunches with your feet anchored.
Dunno about that brand, I only have ever heard it called a core spider though which I am pretty sure is just one companies name for it. You are supposed to put an exercise ball in there and use it for core work.
Yeah my two year old daughter was just stackong plates on there
Looks like a bastardised glute ham raise
Inclined Pec Deck used to perform declined flyes.