The Analysis Console for Intrusion Databases (ACID) is a PHP-based analysis engine to search and process a database of incidents generated by security-related software such as IDSes and firewalls (e.g., Snort or ipchains). It provides a search interface for finding alerts matching practically any criteria. This includes arrival time, signature time, source/dest address/port, flags, payload, etc. ACID also provides the ability to annotate and logically group related events, delete false positives, or archive alerts among databases. Finally, a variety of statistics and graphs can be generated based on time, IP address, ports, alert classification, and sensor.
AIM Sniff is a utility for monitoring and archiving AIM and MSN messages across a network. It can be used to monitor for cases of harassment or warez trading. It has the ability to do a live dump (actively sniff the network) or read a PCAP file and parse the file for IM messages. You also have the option of dumping the information to a MySQL database or STDOUT. AIM Sniff will also monitor for an IM login and then perform an SMB lookup on the originating computer in order to match NT Domain names with IM login names (handles).
AMaViS (A Mail Virus Scanner) scans e-mail attachments for viruses using third-party virus scanners available for UNIX environments. It resides on a UNIX (Linux) machine and looks through the attached files arriving via e-mail, generates reports when a virus is found and sets the delivery on hold.
Advisory Check is a program that reads security advisories for you. It gathers security advisories using RSS, RDF, or XML feeds, compares them against the installed software, and alerts you if you're vulnerable. A wide variety of package managers can be queried to detect installed software. Remote systems can be monitored by using the integrated SSH, Windows-RPC, and Nmap support.