Kandau is a library that offers an easy way to store and retrieve C++ objects (and their relations with other objects) into various backends. SQL, XML, and .desktop backends are currently implemented. It may be as interesting for storing configuration information as it is for storing information in a relational database. Furthermore, you can switch the backend without any change to source code, and it is thus transparent to the application developer.
TimeTracker puts up a list of projects, and the number of minutes worked on each. You click on the project you want to work on, and it starts counting on that. At the end of the day, it saves the collected data in a file, and you can use a script to process the data. The project has been idle for quite a while, and has spawned a host of imitations, including implementations of the same basic idea for Windows, PalmPilot, KDE, and various other contexts.
Xaq is a web application environment for Perl. It includes a collection of applications that use that environment: a form data emailer and a bookmarking system. Xaq applications are entirely configured through a clean, simple Web interface. Xaq will be of particular interest to Web host providers because it is specifically designed to serve multiple independent accounts from a single installation.
qmptombox converts QuickMail Pro files to mbox files, ready for use by Mail.app or whatever your preferred mbox reading mail client is. It's a command line tool that churns out mboxes; just point it at your CE Software folder (usually in the OS9 system folder), and it will generate mboxes corresponding to the mailboxes in QMP. The default output is in Mail.app format.