I'm not going to post such a list. What value would it generate? Such obvious ideas don't need to be said.
Moreover, these kind of ideas are a distraction. People go and implement them as if they were all unique and disconnected from one another. I have known for a while that we need to tackle all of these ideas as a single one.
I'm building a system that will solve 80% of all problems these ideas could ever be solutions to.