I'm a day behind so it's a two-for-one, but a quickie, because I'm behind in every possible metric my life could be measured in.
Number 4 is a tabletop hot-wire foam cutter. Imagine a scrollsaw or bandsaw, but instead of a saw blade, using a piece of hot wire. It excels in cutting intricate shapes out of pieces of expanded polystyrene foam, and can be used on other thin and low-density plastics as well.
Number 5 is an extension of this. By putting the hot wire at the edge of a table, along the corner, a piece of acrylic can be heated evenly along a line, which will allow it to be bent.
Both of these use the same power supply. That will be described as a future project.