The clamav-unofficial-sigs script provides a simple way to download, test, and update third-party signature databases provided by Sanesecurity, SecuriteInfo, MalwarePatrol, OITC, etc. The package also contains cron, logrotate, and man files.
SisyphusScan is a wrapper to malware scanners that can be used for cyclic scanning of files (i.e. accross several executions). The scanning process is optimized with a cache. Currently supports the clamd daemon from the ClamAV tools suite.