The best alternative to NetLimiter is Fort Firewall, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to NetLimiter and three of them are so hopefully you can find a suitable replacement. Other interesting alternatives to NetLimiter are CacheGuard Gateway and TrafficToll.
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.
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.
TrafficToll allows you to limit download and upload bandwidth globally (per interface) and per process, even during the process' runtime.
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Dark mode, traffic shaping and light weight. I finally switched from Netlimiter Pro subscription loop thanks to this Open Source project.
Cheers to the developer or the fort project tnodir for the active development and I look forward to it's future.