Malwarebytes - Malwarebytes protects you against malware, ransomware, and other advanced online threats that have made antivirus obsolete and ineffective. Free Anti-Malware & Malware .
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Windows Defender - Windows 10 security delivers built-in & ongoing protections you can trust: Windows Defender Antivirus, firewall, family settings, ransomware protection, real-time protection & more. Stay up to date & protected at no extra cost.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
Sophos Home - Business-grade cybersecurity for home users
Prometheus - An open-source systems monitoring and alerting toolkit.