Little Snitch is not available for Linux but there are some alternatives that runs on Linux with similar functionality. The best Linux alternative is Portmaster, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Little Snitch and eight of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to Little Snitch are OpenSnitch, ufw, Picosnitch and Firewalld.
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.
Ufw stands for Uncomplicated Firewall, and is program for managing a netfilter firewall. It provides a command line interface and aims to be uncomplicated and easy to use.
Receive notifications whenever a new program connects to the network, or when it's modified
Firewalld provides a dynamically managed firewall with support for network/firewall zones that define the trust level of network connections or interfaces. It has support for IPv4, IPv6 firewall settings, ethernet bridges and IP sets.
The upribox Software turns your RaspberryPi into a privacy-enhancing Wireless router with adblocking, Tor, and a VPN server.
With InJoy Firewall™ 4.0 you can say good-bye to old-generation Firewall solutions that were difficult to implement, manage and measure — InJoy Firewall™ is different...
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It is open source. It seems good even if the last commit was 2 years ago