NTP, the Network Time Protocol, is used to keep computer clocks accurate by synchronizing them over the Internet or a local network, or by following an accurate hardware receiver that interprets GPS, DCF-77, or similar time signals.

spinner sends small packets (null packets or a fancy ASCII spin fan with motion) to keep a link up.

The Mole is an automatic SQL Injection exploitation tool. Only by providing a vulnerable URL and a valid string on the site it can detect the injection and exploit it, either by using the union technique or a boolean query based technique.

xless allows you to view information in an X window. It allows filename (or multiple filenames) arguments, or input via STDIN. It can print the current buffer and do regular expression searches.

SpamBayes uses a different set of algorithm to most statistical spam filters, which enables to dramatically lower the number of legitimate mail classified as spam, through the introduction of an 'unsure' category.