The best open source alternative to NetBalancer is Fort Firewall. If that doesn't suit you, our users have ranked more than 10 alternatives to NetBalancer and four of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to NetBalancer are Traffic Light, CacheGuard Gateway and L7 Filter.
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.
Traffic Light is an open-source tool for tracking your network usage while ensuring total privacy. Inspired by Internet Speed Meter and GlassWire.
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.
L7-filter is a classifier for Linuxs Netfilter that identifies packets based on application layer data. It can classify packets as Kazaa, HTTP, Jabber, Citrix, BitTorrent, FTP, Gnucleus, eDonkey2000, etc., regardless of port.
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This is an OS, not an application.