I'm a programmer and stock submitter so I was just wondering here: What keyword services are you still missing?

I have some working code in my sleeve (that I use for myself) which I could possibly turn into a product for everyone. I wonder if it's something worth thinking about. I could sort keywords by how well they will probably lead to sales, how descriptive they are, suggest missing keywords, calculate how closely they relate to each other, suggest keywords to put together a description, find niche keywords, find keywords that likely don't fit the image, estimate categories etc...