The best open source alternative to Little Snitch is Portmaster. If that doesn't suit you, our users have ranked more than 25 alternatives to Little Snitch and 17 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Little Snitch are LuLu by Objective-See, NetGuard, OpenSnitch and InviZible Pro.
Portmaster is a free and open-source privacy suite that puts you back in charge of your computer.
Portmaster is the most popular Windows & Linux alternative to Little Snitch.
Portmaster is the most popular Open Source & free alternative to Little Snitch.
LuLu is the free, shared-source macOS firewall that aims to block unknown outgoing connections unless explicitly approved by the user.
I've used Little Snitch for many years. However, after buying a new Mac I was faced with buying licences for a whole bunch of apps I had paid for several times in the past. Given this unwanted additional expense and the fact that I really don't need all the extra features of the later versions of Little Snitch, I decided to try alternatives. LuLu absolutely fits the bill for the purpose of stopping apps phoning home without your permission.
Free (Libre) Software is and will be always best for the humanity :)
Almost everyone thinks LuLu by Objective-See is a great Little Snitch alternative.
LuLu by Objective-See is the most popular Mac alternative to Little Snitch.
NetGuard provides simple and advanced ways to block access to the internet - no root required.
InviZible Pro uses DNSCrypt Protocol, Tor and i2pd (I2P Daemon) (PurpleI2P) to achieve maximum security, privacy and comfortable use of the Internet.
It lists activities, broadcast receivers, services, providers, permissions, signatures, shared libraries, etc. of any app
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.
Lockdown Privacy is an Open Source and free firewall for your iOS device. We built the product to help protect users from app developers and analytics companies that are monetizing user data without consent or transparency.
Lockdown Privacy is the most popular iPhone & iPad alternative to Little Snitch.
A fundamental re-design of user Data Privacy. Your multi-tool for online protection. So easy your grandma could use it. Costs less than a cup of coffee per year.
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.
Receive notifications whenever a new program connects to the network, or when it's modified
It is open source. It seems good even if the last commit was 2 years ago
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I Wanted a tool to replace Little Snitch, and this one is GREAT. It is Free, Open Source, and very lite weight.