CRM114 is a Controllable Regex Mutilator and Smart Filter, designed for easy creation of filters for things like incoming email redirection, spam filtering, system logs, or monitoring processes. Filtering rules can be either hard-coded (such as regexes), soft-coded (calculated at runtime or read from an external file or process), or learned dynamically by phrase matching (as in Bayesian filtering, Markovian matching, Winnowing, or Hyperspatial classification). This makes it possible to create very accurate filters with very little actual work. Accuracies over 99.9% are achievable.
CRM114 is a generalized filter. It is useful for spam filtering, syslog monitoring, and other common tasks. CRM114 is a mutating filter based on regex matching, and it can call and be called by shell scripts and commands. When used as a spam filter, it can achieve over 99.9% accuracy.
CSed is a color stream editor. It works like sed, but makes color substitutions. It is a simple filter that can be used to colorize the output of any program. For example, you can use it to replace the color-gcc script or to colorize system logs. It is also an interesting way to learn sed and regular expressions.
CanIt is a server-based spam-control system built around SpamAssassin, MIMEDefang, Apache, and PostgreSQL. It features sophisticated spam-handling techniques which minimize the amount of spam you receive while guaranteeing that you'll never lose a valid email. CanIt achieves extraordinarily accurate discrimination through human intervention, and includes mechanisms to minimize the amount of human intervention required.
Chainmail Milter is a Sendmail mail filter (milter), which allows you to manipulate emails passing through a Sendmail mail server in various ways. Based on the content of the email header and bodies, chainmail can add or remove recipients, reject messages, etc. Chainmail is intended to be a general purpose mail filter, comparable to the well-known procmail program in its mail filter mode.
Clam AntiVirus is an anti-virus toolkit designed especially for email scanning on mail gateways. It provides a number of utilities, including a flexible and scalable multi-threaded daemon, a commandline scanner, and a tool for automatic database updates. The core of the package is an anti-virus engine available as a shared library.