For the soup cans and other regular size cans with a ring pull, I find a wooden spoon handle works well. But I like the looks of that purple puller gadget.
Plastic packages really frustrate me. Ketchup packets, plastic utensil packages, flimsy water bottles where the lid is so small you can't grasp it. If I am at home, I have things to use to help: jar openers, scissors, knives, but when "away" I'm on my own.