1. Final Cut Pro X - if you are into video editing, absolutely get this!
2. Free Download Manager - the absolute best alternative for windows IDM that downloads almost everything from everywhere.
3. Hyperdock - makes hovering a mouse over an app show all open windows Windows-style (sorry for the pun

) and a couple of other cool things, but basically makes working with multiple windows on MacOS not an absolutely miserable experience.
4. Magnet - allows you to easily move windows around the screen, make split view, etc (something that windows does for free, come on, Cook!)
5. Paragon NTFS for MAC - allows you to connect ALL external drives to your mac without all the "unsupported format" ********
6. Go for Gmail - allows you to view gmail from an app, VERY handy!
7. Screenflow - the basic and the best screen recording software
8. FreeChat + FreeChat for Facebook Messenger - allows to you to have whatsapp and facebook messenger chats as Apps, very nice!
9. Patina - a replacement for microsoft paint, I think it's the best one.
10. Amphetamine - stops your Mac from falling asleep and allows you to finetune sleep times etc.