The best free alternative to Little Snitch is GlassWire. If that doesn't suit you, our users have ranked more than 25 alternatives to Little Snitch and 19 is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Little Snitch are LuLu by Objective-See (Free, Open Source), BiniSoft Windows Firewall Control (Free), OpenSnitch (Free, Open Source) and AFWall+ (Free, Open Source).
All-Around System Privacy Since the Portmaster sits on your kernel, you can finally protect your whole computer, not just your browser. Do you want to block Ads and Analytics for your whole operating system? The Portmaster has you covered.
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.
Protects your applications from undesirable network incoming and outgoing activity, controls applications internet access. Allows you to control personal information leakage via controlling application network traffic.
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This alternative is disputed. Windows 10 Firewall Control is still a legitimate alternative to Little Snitch, but it might have issues that some users think are important.