First look at Portmaster, an open source cross-platform network monitor.
Portmaster is a free open source cross-platform network activity monitor that is available in an early version for Windows and the Linux distributions Ubuntu and Fedora.
Portmaster combines traditional network activity monitoring with additional features, such as the option to enforce the use of secure DNS or the automatic blocking of advertisement, trackers and malicious hosts using filter lists, which are commonly used by ad-blockers.
Portmaster is free to use, which usually leads to the question of how development is financed. The developers behind Portmaster reveal information on that on the official project website. Basically, what they plan to do is use a freemium model.
https://www.ghacks.net/2022/05/16/first-look-at-portmaster-an-open-source-cross-platform-network-monitor/
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