ClamAV is a free software, cross-platform antimalware toolkit able to detect many types of malware, including viruses. It was developed for Unix and has third-party versions available for AIX, BSD, HP-UX, Linux, macOS, OpenVMS, OSF (Tru64), Solaris and Haiku. Both ClamAV and its updates are made available free of charge. One of its main uses is for mail servers as a server-side email virus scanner.
References
Wikimedia Foundation. (2024, September 24). ClamAV. Wikipedia. https://en.wikipedia.org/wiki/ClamAV