NetLimiter, pfSense, AdGuard, NetBalancer, OPNsense, NextDNS, CCProxy, Proxychains, NetWorx, ufw, NethServer, TinyWall, TrafficMonitor, ModSecurity, SquidMan, IPCop, Safeshield, TCPBlock, IPFire, Connectify Dispatch, netfilter, Murus Firewall, Comodo Free Firewall, NoRoot Firewall, Trickle, cFosSpeed, Barracuda, All In One WP Security and Firewall, PeerGuardian, Sophos XG Firewall, ConfigServer Firewall, m0n0wall, PFConfig, Check Point Endpoint Security, Firewall App Blocker, E2Guardian, HandyCafe, Shorewall, Bandwidth Management and Firewall, Sygate Personal Firewall, BandwidthD, Norton 360, Polipo, Comodo Internet Security, Advanced Policy Firewall, AutoProxy, KEMP Load Balancer, Artica Proxy, Shadow Daemon, Rusroute, Entonnoir, Weer, BiniSoft Windows Firewall Control, FortKnox Firewall, PC Tools Firewall Plus, Outpost Firewall Pro, ufdbGuard, Blok: Simple Fast Firewall, SoftPerfect Personal Firewall, Dome9 Ubuntu Firewall Management, NoobProof, DefenseWall, MacProxy, WaterRoof are some alternatives to CacheGuard-OS.