ClamAV
Open-source antivirus engine and signature database for mail gateways, file servers, and CI scanning.
Why it is included
GPL-2.0 scanner that underpins many Linux mail and storage hygiene pipelines.
Best for
Server-side scanning, attachment filtering, and offline malware triage.
If you use Windows, Mac, or paid tools
Malware scanning alternative to Windows Defender on servers, Symantec Mail Security, and macOS consumer AV in mail/file pipelines.
Strengths
- Daemon mode
- Freshclam updates
- Automation friendly
Limitations
- Heuristic depth differs from commercial desktop suites
Good alternatives
Commercial AV · YARA rulesets
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