The best Ad Blocker alternative to TrafficMonitor is CacheGuard Gateway, which is both free and Open Source. If that doesn't work for you, our users have ranked more than 50 alternatives to TrafficMonitor, but unfortunately only one of them is a Ad Blocker.
TrafficMonitor alternatives are mainly Anti-Malware Apps, but if you're looking for
Ad Blockers or Firewalls you can filter on that. You can also filter by region, for example
EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to TrafficMonitor.