My downloads folder is pretty messy but I can't just delete things because I still need most of the stuff I download. To "fix" this, I was looking for an app that can automatically organize my downloads, and I stumbled upon Classifier, an easy to use command line tool that can organize files in any directory.

Here's an example - on the left there's a folder which contains various file types (images, archives, documents, etc.) and on the right it's a folder that contains the exact same files as the folder on the left, but after running Classifier to organize it (into folders):