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.
oDns is a simple php/Perl/MySQL frontend to the BIND 8.2.1 Name Server. All the hosts information is saved in four SQL tables. The php-based Web frontend allows you to add/edit/remove domains (primary and slaves) and contact information. In the background, Perl is used to generate standard named.conf and specific zone files for all the primary domains.
BrowserExpress is a Web-based e-mail client. BrowserExpress provides a Web browser interface to any mail server, giving all your users Web-based e-mail from any Web browser. The BrowserExpress interface is fully customizable to support your branding, banner advertisements, and language choice. BrowserExpress implements POP3, SMTP, LDAP, and MIME standards.
ADJE WebMail is a set of Perl CGI scripts which provide a Web interface to existing email accounts on any POP3-compliant email server. The software provides a complete interface, including encoding/decoding attachments, email and URL markup in received emails, and an address book for each user.
ftpUP was designed as a more reliable and quicker acting alternative to dyndns for making Web servers, which are connected via dial-up links, available under a fixed address. It gets your IP on a definable interface and creates an html document containing the current URL of your local server, and uploads it to an existing website. You can also include a logo or other information in the file which is uploaded. Another advantage over dyndns is that the link can point to any URL, ie. your websites can be delivered from anywhere else if your local server goes offline.
shwatchr is a small Perl script that audits logins to shell accounts on Linux/*NIX machines that originate from arbitrary hosts on the Internet. When a successful login occurs and a shell is spawned, shwatchr is executed from the shell rc file and compares the host from which the login originates against a list of known/allowed hosts. If a match is not found then shwatchr can be configured to either send an email to a separate alert email address that contains the time and host from which the login took place or issue a warning and proceed to kill all user shells. shwatchr does not require root to execute and hence users can have some measure of knowledge and security over who is logging into their accounts even if they can't modify firewall or tcpwrapper rulesets, or look at system logs.