What types of apps are you missing from the FOSS ecosystem?

Not looking for an app to control an app but to remind people to rest/exercise their eyes. You might just as well suggest that there aren’t fitness apps or to do apps as people should just get off their phones and do it. More to the point this topic is for people to suggest apps that they would like. Absolutely fine for nobody to want to create such an app but it is ridiculous to be so judgemental about somebody else’s idea. If you don’t like the idea then suggest you just ignore it and get off your screen and on with your life.