The best free alternative to NetLimiter is Portmaster, which is also Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to NetLimiter and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to NetLimiter are simplewall, Fort Firewall, Minimal Firewall and Little Snitch Mini.
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.
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.
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.
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).
All the functionalities of a modern Next-Gen firewall in few clicks: MultiWAN, Deep Packet Inspection, VPNs, Threat Protection.
CacheGuard Gateway is a free and open-source Unified Threat Management (UTM) solution, a Web Application Firewall (WAF), and a Quality of Service (QoS) platform designed to optimize WAN traffic. To obtain a CacheGuard Gateway appliance, download CacheGuard-OS and install it on...
SterJo NetStalker is innovative and FREE security software able to detect all authorized and unauthorized connections to your computer and send you alert for each new connection.
Speed Limiter application can simulate slow TCP/IP connections. All connections from that machine will go trough this app or you can configure only your application to use it as a proxy.
appNetworkCounter is a simple tool for Windows that counts and displays the number of TCP/UDP bytes and packets sent and received by every application on your system.
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Portmaster does not provide a way to set bandwidth limits, so it is not similar enough to NetLimiter to be an alternative.