As @Kresimir alluded to, any such list would be highly subjective and heatedly debated. Even your example is one where some people swear by timeshift and others(like me) would never want it on their system. For me, it isn’t “useful” at all.
The great thing about EOS is that it installs a usable systems that you can choose to expand or customize however you would like. If you want inspiration, topics like the one I linked above or this one may give you some ideas but neither of those nor any list you find on the internet should be treated as gospel.
Only you can decide what is best for your system and how you use it.