The best Network Monitor alternative to ClamAV is Maltrail, which is both free and Open Source. If that doesn't work for you, our users have ranked more than 50 alternatives to ClamAV, but unfortunately only one of them is a Network Monitor.
ClamAV alternatives are mainly Anti-Malware Apps, but if you're looking for
Network Monitors you can filter on that. Other popular filters include
Linux + Open Source,
Linux and
Android. 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 ClamAV.