uMatrix is described as 'Point & click to forbid/allow any class of requests made by your browser. Use it to block scripts, iframes, ads, facebook, etc' and is a well-known app in the Web Browsers category. There are more than 50 alternatives to uMatrix for a variety of platforms, including Mac, Google Chrome, Windows, iPhone and Firefox. The best alternative is uBlock Origin, which is both free and Open Source. Other great apps like uMatrix are Privacy Badger (Free, Open Source), NoScript (Free, Open Source), AdGuard (Freemium, Open Source) and Blokada (Free, Open Source).