ACOPOST is a set of freely available POS taggers modeled after well-known techniques. The programs are written in C (aiming for extreme portability and code correctness/safety) and run under various Unix flavors (and probably even under Windows). ACOPOST currently consists of four taggers that are based on different frameworks: Maximum Entropy Tagger (MET), Trigram Tagger (T3, based on Hidden Markov Models), Error-driven Transformation-based Tagger (TBT or Brill Tagger), and Example-based tagger (ET).
ActivDesk adds a powerful and feature rich help desk system to your Web site. It was created to streamline customer communications and support with a ticketing system. It was created to be user friendly in every aspect. It is highly customizable to be completely re-brandable so that it can fit the look and feel of your Web site. It eliminates spam and related problems. It also comes with built-in knowledge base functionality to turn resolved tickets into knowledge base entries, and has many more features.
The Ad hoc Protocol Evaluation testbed is a small Linux distribution intended for the analysis of ad hoc networking environments. It is self-contained and pre-configured, and contains tools for data gathering at both the IP and ethernet level. It also has a scenario scripting system, which enables APE test runs to use movement choreography, with instructions to participants.
Ad Censor is a Web proxy which filters out annoying ads by matching requested URLs with a blacklist and by checking the HTML code for suspicious tags which the user can define with Perl regex patterns. It can work in tandem with another HTTP proxy, it has an easy-to-use GUI config editor, and it can also block cookies.
AdPass is a high-end password protector and member management system. Notable features include built in third party credit card gateway support, a crediting system, a template-based script for complete control over its look and feel, a built in newsletter program, member login announcement, and much more.
Addns.pl is a self-contained DynDNS update client for DynDNS.org (and possibly others). It supports a variety of IP detection methods including external webcheck/router pages. It also supports multiple configurations and hostnames, smart abuse prevention, and custom/static/dynamic DNS, and can run as a daemon, commandline options only, or with a configuration file.
ACP is basically a wrapper for SSH and SCP that allows a user to select, or manually enter, a group of hosts to connect to. The user can run a command or copy some files/directories to multiple hosts by issuing a single command on the "admin" host. It requires the fping program, as it checks the specified hosts for connectivity, and will only try to run the command on/copy files to hosts that are reachable.