coastal-qt is a small collection of Qt 4/5 desktop applications built around a small Qt extension library. The library mostly focuses on missing features and services like OSD desktop notifications (with DBUS bindings) and offers some convenience classes for Qt. The current applications include a GUI man page viewer, a search tool, and a desktop user notification service daemon with multicast chat.
BookONO eBook Manager is an e-book manager and convertor designed as a compliment to Calibre. It is not a rewrite of Calibre, but instead an alternative product which makes some different design decisions. It uses Calibre to do a lot of the heavy lifting, so despite being an independent application, it is considered complimentary to Calibre.
lindyFrame is a desktop application framework which eliminates the development time needed to create software tools. The framework provides the ability to create applications which support several languages and loading resources from network sources. The core aspect of the tool is a plugin architecture which the developer uses to build the desired functionality in the desktop application. Multiple plugins can be created and loaded which will operate in their own individual threaded environments.