awesome-qt

PyQt is a set of Python v2 and v3 bindings for Qt and runs on all platforms supported by Qt including Windows, MacOS/X and Linux. PyQt5 supports Qt v5

The PySide project provides LGPL-licensed Python bindings for the Qt. It also includes complete toolchain for rapidly generating bindings for any Qt-based C++ class hierarchies

A library for creating, reading, writing and manipulating file archives like zip and tar. It also provides transparent compression and decompression of data, using formats like gzip, via a subclass of QIODevice

Taking a hint from the similarly-named Java Cryptography Architecture, QCA aims to provide a straightforward and cross-platform crypto API, using Qt datatypes and conventions

QxOrm library is an Object Relational Mapping (ORM) library for C++/Qt developers

Bacon2D

Bacon2D is a framework to ease 2D game development, providing ready-to-use QML elements representing basic game entities needed by most of games

V-Play Game Engine allows easy cross-platform mobile game development for all major platforms including iOS, Android, BlackBerry

QtAv

A multimedia playback framework based on Qt and FFmpeg to write a player easily

libmaia

libmaia is a easy-to-use XML-RPC library for Qt

qxmpp

Cross-platform C++ XMPP client and server library

QDjango is a web framework written in C++ and built on top of the Qt library. Where possible it tries to follow django's API, hence its name

cool-retro-term

Is a terminal emulator which mimics the look and feel of the old cathode tube screens. It has been designed to be eye-candy, customizable, and reasonably lightweight

Tiled is a general purpose tile map editor. It is meant to be used for editing maps of any tile-based game, be it an RPG, a platformer or a Breakout clone