The best Network Monitor alternative to Pi-hole is Portmaster, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Pi-hole and four of them are Network Monitors so hopefully you can find a suitable replacement. Other interesting Network Monitor alternatives to Pi-hole are simplewall, OpenSnitch and Firewalla.
Free, open-source privacy suite monitoring all network activity, blocking unwanted connections, using trusted filter lists for ads and malware, enforcing DNS-over-TLS, providing custom app and global rules, and supporting advanced privacy management.
It has most the same features regarding a single host, but as it’s a software, you can take it with you wherever you go!
Simple tool to configure Windows Filtering Platform (WFP) which can configure network activity on your computer.
Lovely local firewall, but surely no alternative to a self-hosted DNS-blackhole :)
Firewalla is a vital security addition to every home and small business with network and IoT devices.
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Portmaster is a (great) local firewall, pi-hole is a dns-blackhole. Not an alternative in the slightest though.