OpenSnitch is described as 'GNU/Linux port of the Little Snitch application firewall' and is a Firewall in the Network & Admin category. There are more than 10 alternatives to OpenSnitch for a variety of platforms, including Linux, Windows, Mac, Android and Android Tablet. Most alternatives are Firewalls and Network Monitors. The best alternative is simplewall, which is both free and Open Source. Other great apps like OpenSnitch are GlassWire (Freemium), BiniSoft Windows Firewall Control (Free), Little Snitch (Paid) and Gufw (Free, Open Source).
Gufw is an easy, intuitive way to manage your Linux firewall. It supports common tasks such as allowing or blocking pre-configured, common p2p, or individual ports port(s), and many others! Gufw is powered by Uncomplicated Firewall (ufw).
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Gufw vs OpenSnitch opinions
This alternative is disputed. Gufw is still a legitimate alternative to OpenSnitch, but it might have issues that some users think are important.
it's a Firewall not an application Firewall
Negative comment • over 3 years ago
the ufw/gufw doesn't help to monitor new connections from your system to "outerspace"
NetGuard provides simple and advanced ways to block access to the internet - no root required. Applications and addresses can individually be allowed or denied access to your Wi-Fi and/or mobile connection.