OpenSnitch is a comprehensive open source Linux application firewall
This is not a simple firewall to get started with as it can be a bit of an uphill battle to get all the outgoing connections vetted (if you want to filter those), but I'd imagine once set up, it is a pretty powerful tool to have.
Key features:
* Interactive outbound connections filtering.
* Block ads, trackers or malware domains system-wide.
* Ability to configure system firewall from the GUI (nftables).
* Configure input policy, allow inbound services, etc.
* Manage multiple nodes from a centralized GUI.
* SIEM integration
It is regularly updated, with 74 contributors contributing to over 30 releases. The project has also received over 10,000 starts.
See
GitHub - evilsocket/opensnitch: OpenSnitch is a GNU/Linux interactive application firewall inspired by Little Snitch.
OpenSnitch is a GNU/Linux interactive application firewall inspired by Little Snitch. - evilsocket/opensnitch
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