mod_header_modify can change or remove incoming HTTP headers, and it can also add headers that weren't sent by the client. It can thus be used to manipulate the behaviour of content handlers that you don't want to (or can't) change. Another option might be to simulate various user agents, perhaps in conjuction with mod_rewrite.
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.
gtkform is a gtk+ container that resembles the Motif XmFormWidget's behavor. For every edge (side) of a widget, you can assign an attachment. These attachments can be relative to the form or to another widget. The attachments determine the layout behavior of the form when resizing occurs.