GFI offers freeware for ISA Server

GFI is offering a free version of GFI DownloadSecurity for ISA Server 6, its content security product that handles the security risk of file downloads without resorting to blocking them all at firewall level. The freeware version scans HTTP and FTP downloads at the network perimeter using a single anti-virus engine, and can be used as additional protection by companies who do not yet perform virus scanning at firewall level.
Press Release