Next is the pattern notcher, I use it to make notches in my final pattern. Adding notches makes me double check that each seam matches up so I don't end up with a side seam longer than the other.
Without a doubt, the most essential tool in patternmaking are the rulers. Here are the ones I used the most often: plastic inch ruler, 2 aluminum Fairgate vary form curve and a adjustable little ruler which is great for adding seam allowances to patterns. I also use a aluminum yard stick (not pictured) a lot that I purchased from Home Depot a few years ago.