Portmaster is described as 'Free and open-source tool that monitors all network activity, blocks unwanted connections, uses filter lists for ads and malware, enforces DNS-over-TLS, and sets custom app rules' and is a very popular Firewall in the security & privacy category. There are more than 25 alternatives to Portmaster for a variety of platforms, including Windows, Linux, Android, Mac and iPhone apps. The best Portmaster alternative is NextDNS, which is both free and Open Source. Other great apps like Portmaster are AdGuard, Pi-hole, simplewall and RethinkDNS.
SterJo NetStalker is innovative and FREE security software able to detect all authorized and unauthorized connections to your computer and send you alert for each new connection.
North Macedonia
China
Karma Firewall app lets you take control back of your phone and block internet traffic to and from specific apps. This is a simple yet powerful firewall with an easy to use intuitive GUI which allows you to protect your sensitive data.
Free adblocker, anonymity, traffic and battery saver, firewall, and Internet speed increase.
Japan
Perfects the Windows Firewall offering additional security. Get the most out of your Windows firewall, create new security rules for your online applications, alerts you to anomalies with real-time protection.
Germany
EU
Bouncer is an application to help you choose the correct firewall zone for wireless connections. When you connect to a new network, Bouncer will open a window prompting you for what kind of network (eg home, public, work) it is.
NetGenius is a modern Internet connection monitoring, control and optimization tool. It lets you watch the apps using your Internet in real-time, control their access, and get detailed usage reports. Bandwidth-sensitive applications like voice calls, videos or games can be...
Australia
Block unwanted ads for faster browsing with Total Adblock. Remove banners, pop-ups, and video ads. SAVETIME by decreasing data usage and improving privacy while prolonging battery life. Easy iOS setup requires a paid account, offering custom filters and an Allow list for trusted sites.
United Kingdom
PEShield — privacy-first Android toolkit for digital sovereignty. A local firewall blocks trackers, ads & telemetry on-device; nothing leaves your phone. Plus an offline security AI, encrypted messenger, mesh/off-grid, a code studio & a camera chip scanner. No Google.
