The best Privacy Tool alternative to Portmaster is NextDNS, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Portmaster and nine of them are Privacy Tools so hopefully you can find a suitable replacement. Other interesting Privacy Tool alternatives to Portmaster are AdGuard, Little Snitch, OpenSnitch and InviZible Pro.
NextDNS protects you from all kinds of security threats, blocks ads and trackers on websites and in apps and provides a safe and supervised Internet for kids — on all devices and on all networks.
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.
Firewall application for monitoring and controlling outbound network connections, notifying users of attempted access, supporting rule-based blocking, real-time alerts on suspicious activity, and preventing unauthorized data transmission on macOS systems.
InviZible Pro uses DNSCrypt Protocol, Tor and i2pd (I2P Daemon) (PurpleI2P) to achieve maximum security, privacy and comfortable use of the Internet.
Minimal Firewall is a portable Windows firewall frontend that alerts users to internet connections without requiring custom kernel modifications or disabling core isolation, striking a balance between TinyWall's security and SimpleWall's functionality.
Receive notifications whenever a new program connects to the network, or when it's modified
Firewalla is a vital security addition to every home and small business with network and IoT devices.
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AdGuard is great, but it's not a firewall/port system.