The best free Firewall alternative to GlassWire is Portmaster, which is also Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to GlassWire and 19 are free Firewalls so hopefully you can find a suitable replacement. Other interesting free Firewall alternatives to GlassWire are simplewall, Fort Firewall, TinyWall and BiniSoft Windows Firewall Control.
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.
Simple tool to configure Windows Filtering Platform (WFP) which can configure network activity on your computer.
TinyWall is a free software to harden and control the advanced firewall built into Windows Vista, Windows 7 and Windows 8. TinyWall includes a combination of features that sets it apart from both commercial and freeware firewalls: TinyWall does not annoy you with popups at all...
A powerful tool which extends the functionality of Windows Firewall and provides new extra features which makes Windows Firewall better.
InviZible Pro uses DNSCrypt Protocol, Tor and i2pd (I2P Daemon) (PurpleI2P) to achieve maximum security, privacy and comfortable use of the Internet.
LuLu is the free, shared-source macOS firewall that aims to block unknown outgoing connections unless explicitly approved by the user.
Minimal Firewall is a portable Windows firewall frontend that alerts users to internet connections without requiring custom kernel modifications or disabling core isolation, striking a balance between TinyWall's security and SimpleWall's functionality.
Free Firewall is a full-featured professional firewall that protects against the threats of the Internet. Control every program on your computer by permit or deny access to the Internet. Free firewall notifies you when applications want to access the Internet in the background...
As soon as you’re connected to the Internet, your apps can send whatever they want to wherever they want, unnoticed by you, because all of this happens invisibly under the hood.
Windows Firewall Notifier (WFN) extends the default Windows embedded firewall behavior, allowing to visualize and handle incoming or outgoing connections.
Austria
EU
Russia
Hungary
United States
Italy
Ukraine
Germany
Vietnam
Powerful control for the tech-savvy. More free firewall blocking options than Glasswire, which only allows 2 blocks for free.