I probably could do four or five posts on kitchen gadgets. I have several on eggs alone. For example, here’s Henrietta hen, who makes perfect softboiled eggs:
A little slicer that snips off the top of said egg:


An egg separator (great for baking with children who want to separate eggs, but can’t quite manage it). And a collection of whisks.
The littlest one is perfect for whisking a single egg, and the wooden-handled, open-bottom one is great for mixing sauces (no lumps!), the flat one does a great job folding in egg whites.
Three of these belonged to my mother, and will probably outlast me!

Then, of course, there’s the banana slicer, an indispensable tool, as witnessed by these comic reviews on Amazon.
Be sure to scroll down and read them–they’re as good as a poem (some might say better).
And just in case you’re wondering. of course I bought one! It saved my marriage.
