Recommended for EVERY Mac user. There is a free version and a paid version of this software. The free version will remove any adware (if you already have it), while the paid version will prevent you from getting it in the future. I do recommend the paid version at this point, but if you don't want to buy it, just AT LEAST get the free version! NOTE: THERE IS STILL A FREE VERSION! ON THE NEXT PAGE SCROLL DOWN AND CLICK ON "14 DAY FREE TRIAL" THE MAIN FEATURE WILL STILL WORK AFTER THE TRIAL HAS EXPIRED.
Clean My Mac X
If you need to clean up your Mac, I'd recommend watching my class (link below) which will help you with the initial process, but Clean My Mac X does a good job of finding the many smaller flies that can take up space. The new version also includes Malware protection.
Passwords suck. Last Pass makes it suck less. Works with every operating system out there, installs into your web browser, and let's you share passwords with loved ones (making it a wonderful solution as a type of "digital will")
Microsoft OneNote is a great tool for business professionals and students. It's a competitor to Evernote, but in resent years, I've favored OneNote over Evernote. It's also Free!
Magic Window 4K
I just love this app especially on any Mac with a 4k or 5k display. It transforms your boring desktop background into beautiful time-lapse photography from all over the world.