[murermader]

You can use tools like CleanMyMac to show folders and their sizes. All cache and library files are counted under System, e.g. files from vagrant, docker, vms, old jetbrains IDEs, caches from rarely used/uninstalled apps etc.

You don‘t need to buy the full version, you can just use the info and delete it manually in Finder.

[ryandrake]

Having to reach for a 3rd party tool to keep litter off your system is the opposite of the Just Works marketing that Apple stands by. One of the reasons for switching over to a Mac is so you don't have to sit there running these dicey Cleaner and Sweeper apps just to keep your system maintained. If a software's (OS or otherwise) pile of vague "caches" and "library files" grows unbounded, then I would consider that a bug.