pscal is a simple shell script that creates PostScript calendars. It's not the most advanced calendar creator available, but for quick, nice looking calendars, it's very handy to have sitting in your bin directory. Features include: font selection, user-defined holidays, phase of moon, and days past/remaining in the year.
Rain's PPP scripts simplify the use and setup of pppd. Features include connection time logging, a ppp-off that works right with more than one pppd running, dial-on-demand support for pppd 2.3.x., and more. Another interesting feature is that the scripts keep track of your connect speed and time, and included is an mirc script to show connection status from a remote machine, as well as a shell script that works for *IX boxes.
rh-errata is a tool for maintaining the integrity of a Red Hat Linux system. It builds a respository of RPM files from a designated mirror of the Red Hat updates site. It only downloads RPM files that have not already been downloaded. Optionally, it can produce a report that shows which RPM files in your respository need to be updated and which ones have already been installed.
Runmaint is a shell script for invoking regular jobs. It delivers the output (if any) via mail with a meaningful subject line to the people of your choice. It moves all the complexity from the crontab into an easily managed collection of scripts. Runmaint expects to be run out of cron.
scdbackup is a simplified CD/DVD backup program for Linux. It can back up large amounts of data on one or more media, with no special tools needed for reading the backup. It supports ISO9660 filesystems and afio archives. Its special features are automatic division of data into multiple volumes, verification of write success, incremental backups, a search and restore helper for large ISO9660 backups. CDs get written via cdrecord, wodim, cdrskin, or xorriso. DVDs and BDs get written via growisofs, cdrskin, or xorriso.
The Seattle Firewall is an ipchains firewall that supports IP masquerading and can be used on a standalone system, on a dedicated firewall system, or on a multi-use gateway/server. It supports VPN via IPIP tunnels, IPSec, and PPTP. It is easily configurable by editing configuration files, and can be extended without modifying the base product. It also includes realtime monitoring with an audible alarm that sounds when suspect packets are detected.
sh-httpd is a shell script-based Web server that supports GET and HEAD methods, and a CGI 1.1 interface. It's not real fast, and it's probably not real secure, but it is really small. The Web server and it's configuration files are around 9,000 bytes total, and that's with comments and pretty whitespace. If you can run ash or bash, an inetd, and about 7 standard external commands on your system, you can have a Web server with CGI support. There's also a timeout counter that kills never-ending CGI programs, cleans up, and exits.