smtpfilter is a filter for an SMTP session which passes the session through transparently in real time, except for the DATA command which is intercepted in order to scan the data for spam and/or viruses with the scanner of your choice. The sources are heavily commented. The default spam filtering is a hybrid approach that uses spamassassin to self-train the excellent spamprobe Bayesian filter which works on a per-site rather than per-user basis. The virus checking can use clamav or NAI, or any other command- line scanner.
smupcheck, which stands for Smart Update Checker, checks Web sites for updates automatically, even if they don't offer an RSS feed. It is a very basic tool, and does not offer advanced features such as checking password-protected Web sites, highlighting changes, or filtering results.
sn is a small news system for sites which serve perhaps a few dozen newsgroups, and which have a slow connection to the Internet. The target user is a home or SOHO with a single modem connection to the Internet and serving a few workstations. sn also includes a mail-to-news filter.
snapscreenshot takes a screenshot from a single Linux virtual console (tty) or from a group of ttys. It does not care if it is a plain text mode or framebuffer console; it only needs read-access to /dev/vcsa* -devices. The program outputs a tga file to stdout; use an image manipulation program to convert it to png or whatever you prefer.
The sniffy project can trace/log the data of any pseudo terminal in the system. Due to the way the terminal works, such a terminal trace provides complete information of what happened on the terminal screen, and sniffy is able to display/replay this information. It consists of a kernel module able to connect/hook on the pseudo terminal, a program to display the contents of any pseudo terminal on the fly, a daemon process tracing the pseudo terminal content into the file, and a replay program to replay any stored pseudo terminal session.
snmp2xml is a program to convert snmpget output to XML. The output from snmpget, snmpwalk, or snmpbulkwalk is first filtered to correct for SNMP agent flaws and then processed into XML. This XML can be passed through xmllint to tidy it up or it can be processed by an XQuery or XSLT processor. The XML output represents all the SNMP data such that the original SNMP output can be reproduced if desired with an XSLT stylesheet (which is included). The snmp2xml converter has been tested on 7 SNMP agents: Mac OS X, Apple Time Capsule, the Billion ADSL router, the Huawei S9306 switch, the Foundry/Brocade CES and MLX-4 switches, and the Nortel 425 switch.