Maid is described as 'Be lazy. Let Maid clean up after you, based on rules you define. Think of it as "Hazel for hackers"' and is a File Manager in the File Management category. There are seven alternatives to Maid for a variety of platforms, including Mac, Windows, Linux, Android and iPhone. The best alternative is Hazel. It's not free, so if you're looking for a free alternative, you could try Easy File Organizer or Organize. Other great apps like Maid are Cataleezr (Freemium), Spotless (Freemium), DeClutter: File Tagger and Organizer (Free, Open Source) and Declutter (Paid).
Declutter is an elegant solution to Desktop Clutter that every Mac user faces. It automatically keeps your desktop organised and clean always by moving the files on the Desktop to smart folders using rules based on file names and extensions.