The green item is a seam ripper and threader, as the writer above identified. I was one of the very few lucky people, who got replacement pieces for my threader when I found it, and I love it!
I think that several of the other feet are types of hemmers and tuckers. Most older machines came with quite an assortment. Yours, however, are for older machines, as you can tell by the way they attach at the bottom of the foot.