htmLawed is a PHP script that makes input text more secure, HTML standards-compliant, and suitable in general from the viewpoint of a Web-page administrator, for use in the body of HTML 4 or XHTML 1 or 1.1 documents. It is a customizable HTML/XHTML filter, processor, purifier, and sanitizer. It can ensure that HTML tags are balanced and properly nested tags, neutralize code that may be used for cross-site scripting (XSS) attacks, and limit the allowed HTML elements, tags, attributes, or URL protocols.
surblhost is a command line program that check if hostnames are blacklisted in the surbl.org lists. A blacklisted hostname means that the site is referenced in spam email. Although surbl is mostly used by spam filters such as spamassassin to identify spam email, you can use surblhost for many other purposes.
libspawner implements the MTA side of Sendmail's Milter (mail filter) protocol that is used by the MTA to delegate policy decisions to external daemons. The main purpose of this library is to enable other MTAs, or any mail-handling software, to talk to the existing mail filters that have been developed for Sendmail.
Proxmox Mail Gateway provides a powerful and affordable server solution to manage your email traffic, to eliminate spam, and to block undesirable content or viruses from your email system. Proxmox uses a wide variety of local and network tests to identify spam signatures. The flexible architecture and the easy-to-use configuration interface safeguard companies against existing and new email threats.
alph implements and analyzes historical and traditional ciphers and codes, such as polyalphabetic, substitutional, and mixed employing human-reconstructable algorithms. It provides a pipe filter interface in order to encrypt and decrypt block text to achieve transparency. The program is meant to be used in conjunction with external programs that transfer data, resulting in transparent encryption or decryption of information. The program can thus be used as a mail filter, IRC filter, IM filter, and so on.