Malwarebytes

Malwarebytes for Mac protects against malware - including trojans, spyware, keyloggers, viruses and more - as well as adware and potentially unwanted programs. Additionally the software can detect and remove existing infections. Basic free version of the software offers manual scanning and removes infections after an attack. For real-time protection that actively prevents infections and protects against malware, viruses, adware, spyware, Trojans and other threats, including blocking unwanted programs, Malwarebytes offers a 30-day free trial of its Malwarebytes for Mac Premium software.

Requirements:

macOS 10.10 and later

Limitations:

Free version comes with a 30-day trial of Premium