Paperbox is a document browser. It lets you nicely view your ebooks, office and text documents and organize them by tags. Relying on Tracker, it is able to instantly discover all documents on your desktop and present them in a convenient way. Tags and other metadata are shared across all Tracker-based applications.
CeeMedia is a program for cataloguing your movie collection. It can retrieve information and cover images from places such as Amazon, IMDb, All Movie Guide, and AlloCiné. You can also write your own plugin for retrieving data from your favorite movie site. It also generally tries to provide the user with the most comfortable interface available for the task, while trying to follow the GNOME Human Interface Guidelines.
Gourmet Recipe Manager is a simple but powerful recipe managing application that is intended for the GNOME desktop environment, but should work on any platform that Gtk supports. It allows you to collect, search, and organize your recipes, and to automatically generate shopping lists from your collection. It aims to make it easy to enter and organize your recipes with an intuitive interface.
GPassguard is a GTK+ frontend to the *PassGuard suite, which manages passwords in an encrypted file so that you only have to remember one. It uses the PassGuard Framework and can be interfaced with any kind of encryption via a plugin system. It allows you to copy passwords to the clipboard.
DWI, Data With Interaction, is an Object-to-Relational Mapping (ORM)-based RAD (Rapid Application Development) system for rapidly creating data-driven desktop GUI applications. It maps SQL tables into several object systems, including QOF, GLib GObjects, and GTK/GNOME. It can be used with the Glade GUI designer. It supports multiple databases through ODBC and libdbi.