AdAway - An ad blocker that uses the hosts file. For Android, requires root.
Adblock Plus - AdBlock Plus is a browser extension for Firefox, Chrome, Opera, and several other popular browsers that prevents intrusive ads like pop-ups and malicious code from appearing on websites you visit.
Ghostery - Privacy tool for transparency and control
AdBlocker Ultimate - Cross-browser ad-blocking solution.
AdGuard - Surf the Web Ad-Free and Safely. Shield up!
Pi-hole - Pi-hole is a multi-platform, network-wide ad blocker.