ClamAV 0.99 AntiVirus recently released, contains major new features and changes. YARA rules, Perl Compatible Regular Expressions, revamped on-access scanning for Linux, and other new features join the many great features of ClamAV: Processing of YARA rules (some limitations- see signatures.pdf). Support in ClamAV logical signatures for many of the features added for YARA, such as Perl Compatible Regular Expressions, alternate strings, and YARA string attributes. See signatures.
ClamTk is an open source desktop application that provides users with a graphical user interface for Clam AntiVirus virus scanner application that runs on Linux-based operating systems. ClamTk uses Perl and Gtk libraries and it’s designed to be an easy-to-use, lightweight, on-demand antivirus scanner for Linux systems. It has been ported to Fedora, Debian, RedHat, openSUSE, ALT Linux, Ubuntu, CentOS, Gentoo, Archlinux, Mandriva, PCLinuxOS, Frugalware, FreeBSD, and others ClamTk changes since 5.