Arb-Scan is a remote banner scanner written in bash and Perl. It supports 12 different services banner checks (daytime, ftpd, sshd, smtpd, domain, finger, httpd, pop2, pop3, nntp, imapd and snpp). It features IP file reading, logging, random IP scanning, ftp anonymous login checking and VRFY/EXPN smtp checking.
Teach-SA reads mail in designated maildir folders (spam on the one hand, ham on the other) and feeds them to Spamassassin for Bayesian learning and submission to various spam detection schemes. It is good for implementing any sort of supervised training in addition to Spamassassin's unsupervised training (also known as automatic whitelist) while reducing training-related admin workload to nearly zero. It fits any setup storing mail as maildir, but could trivially be modified to work with mbox based systems. It was originally developed so that users could report spam by moving it to a specific folder in their own IMAP mailbox.