Adblock Plus blocks all annoying ads on the Internet. It may also block other things, like tracking. With more than 50 million users, Adblock Plus is the world’s most popular browser extension. Adblock Plus exists to save users from annoying ads. It is free but usage is limited to 5 supported browsers.
Malwarebytes Anti-Malware – relatively new project, but already became one of the leaders of antimalware and antispyware industry. The key to its success is obvious – simple interface, great database, speed, and super effectiveness in fighting against modern threats. Software has free version, but you can buy module of active protection.