[mhammerc]

Yes!

You can go to the folder ~/Library and then delete what you want.

To open the folder from a terminal: cd ~/Library open .

In the Finder, you can enable "Calculate all sizes" from "View options," which will calculate folder sizes to understand what to clean first.

This folder contains data from all apps; sometimes it is cache, sometimes persistent data. You will find all your previous apps taking gigabytes...

[JSR_FDED]

~/Library/Caches - you can probably delete stuff

~/Library - definitely not

[mhammerc]

As an example, I have ~/Library/Android/sdk which takes 8 Go.

If I know I do not need the Android SDK, I can safely delete it.