The best open source alternative to NetLimiter is Portmaster. If that doesn't suit you, our users have ranked more than 25 alternatives to NetLimiter and 13 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to NetLimiter are simplewall, Fort Firewall, Minimal Firewall and Gufw.
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.
Standalone firewall for Windows 7 and later featuring flexible rules by application, address, or protocol, wildcards, parent process filtering, SvcHost controls, blocklists, bandwidth graphs, traffic stats tracking, speed limits, and real-time network monitoring.
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.
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, open-source network security appliance for startups, growing businesses, and SMEs/SMBs that need enterprise-grade protection without the complexity or cost.
GUI Client for vnStat Network Monitor for Linux or GNU/Linux - GitHub - Hulxv/vnstat-client: GUI Client for vnStat Network Monitor for Linux or GNU/Linux
Bouncer is an application to help you choose the correct firewall zone for wireless connections. When you connect to a new network, Bouncer will open a window prompting you for what kind of network (eg home, public, work) it is.
TrafficToll allows you to limit download and upload bandwidth globally (per interface) and per process, even during the process' runtime.
trickle is a portable lightweight userspace bandwidth shaper. It can run in collaborative mode (together with trickled) or in stand alone mode.
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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.