- Supports A, AAAA, ANY, CNAME, MX, NAPTR, NS, PTR, SOA, SRV, and TXT DNS queries.
- Alfandega Firewall
- Alfandega Firewall is a collection of Perl modules that helps users to implement iptables-based firewalls for two interfaces. It provides local and remote blacklists, spoofing checks, packet forwarding, ICMP control, service configuration, and more.
- 'amavisd-new' is an interface between MTAs and content checkers, including virus scanners, and/or the Mail::SpamAssasin Perl module. It talks to the MTA via (E)SMTP or LMTP, or by using helper programs. No timing gaps exist in the design, which could cause a mail loss. It is normally positioned at or near a central mailer, not necessarily where the user's mailboxes and final delivery takes place.
- And-httpd is an HTTP server that maps URLs to files. In other words, in can take an incoming URL and map it to a file in a number of ways (for example, according to content type or language). It can also do authentication or IP based ACLs. It cannot do CGI or other kinds of code execution. It cannot even dynamically create directory listings (although it comes with external tools to do so automatically, and to create a "status page"). It currently has a $2000 "security guarantee" against remote attacks.
- Anontwi - is a tool for OAuth2 applications (such as: GNUSocial, Twitter...) that provides different layers of encryption and privacy methods.
- 'AntiExploit' scans for well known exploit files. It currently recognizes over 1700 suspicious files, and the database is updated weekly. It is not meant to be a IDS or high-profile security-application, but rather an extension to other security checks. 'aexpl' was developed for a freeshell-server to track script-kiddies.
- 'apf' (active port forwarder) uses SSL for secure packet tunneling. It is meant for users without an external IP who want to make some services available on the Internet. afserver is placed on the machine with a publicly accessible address. afclient is then placed on the machine behind a firewall or masquerade, which makes the second machine visible to the Internet. You do not need root privileges to run afserver, nor does it use other processes. It uses 'zlib' to compress the transferred data.
- ArgusEye is a GUI for some of the features of Argus. Argus is a powerful suite of tools for transaction-based network auditing. ArgusEye aims at supporting daily work with Argus by providing a graphical user interface.
- arkOS is a lightweight Linux-based operating system, initially targeted to run on a Raspberry Pi, intended to make self-hosting server software as easy as possible. It has different components that interact to achieve these ends, chief among them an integrated application called Genesis which graphically manages the server and its components. With Genesis, users can easily add/remove server software, manage websites, change system settings and more from a reliable visual interface that's easy to use. arkOS puts a focus on user's experience, requiring no command line experience to run well. In the future, users will also be able to host their email accounts, chat accounts, and social networking profiles from an arkOS server just as easily.
- 'arpalert' listens on a network interface, catches all conversations of MAC address to IP request, and compares the MAc addresses it detected with a pre-configured list of authorized addresses. If the address is not on this list, arpalert launches an alert script with the MAC address and IP address as parameters. 'arpalert' can run in daemon mode and is very fast (low CPU and memory consumption). It responds at signal SIGHUP (configuration reload) and at signals SIGTERM, SIGINT, SIGQUIT and SIGABRT (Kwhere it stops itself).
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