Clam AntiVirus（ClamAV）是免费而且开放源代码的防毒软件，软件与病毒码的更新皆由社群免费发布。目前ClamAV主要是使用在由Linux、FreeBSD等Unix-like系统架设的邮件服务器上，提供电子邮件的病毒扫描服务。ClamAV本身是在文字接口下运作，但也有许多图形接口的前端工具可用，另外由于其开放源代码的特性，在Windows与Mac OS X平台都有其移植版-Clam AntiVirus (ClamAV) is a free and open source anti-virus software, software updates and virus free publication chosen by the community. ClamAV is currently mainly used on the Linux, FreeBSD and other Unix-like systems set up mail server, provide e-mail virus scanning service. ClamAV itself is an interface operating in text, but there are a lot of graphics interface of the tool is available, in addition due to the nature of its open source, in Windows and Mac OS X platform has its portable version