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 five of them are Network Monitors so hopefully you can find a suitable replacement. Other interesting Network Monitor alternatives to Pi-hole are AdGuard, 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.
Ad-blocking solution eliminating intrusive ads and preventing tracking, with malware protection. Filters pop-ups, banners, and more for clean browsing. Works in the background for ad-free surfing, protects data privacy with Spyware filter, and controls ad display in apps.
Simple tool to configure Windows Filtering Platform (WFP) which can configure network activity on your computer.
GNU/Linux firewall enabling interactive outbound network filtering, outbound application control, blocking of ads and malware domains, centralized GUI node management, input policy configuration, SIEM integration, real-time alerts, and user-level rule customization.
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.