Barcodes for Python is a library that can create EAN-13, Code-128A, Code128-B, Code128-C, and Gs1 barcodes. It also includes a CLI tool that can generate barcode image files and GTK+ and Qt GUI examples with printing support. The barcodes is produces have been verified using a cheap Deltaco (KB Wedge B519153) CCD handheld barcode scanner.
Trojita is a Qt IMAP email client. It is a pure Qt4 application with no additional dependencies. It has a robust IMAP core implemented using Qt's Model-View framework. Standards compliance is a design goal. It has support for bandwidth-saving mode aimed at mobile users with expensive connections. In addition to the usual SSL/TLS connections, the server can be accessed via SSH. It has on-demand body part loading, offline IMAP support, and safe dealing with HTML mail (actually more robust than Thunderbird's).
XRDL is a language and tools for automatic client generation for XML-RPC services. It provides a way to create simple service definitions for XML-RPC services. It is inspired by WSDL, but aims for ease of use in the spirit of XML-RPC. It supports exporting complex (recursive) types, as well as methods. It includes a number of tools, allowing automatic XRDL generation for servers and clients written in PHP or C++/Qt.