Diluculum is a library that intends to make the coexistence of C++ and Lua more harmonious. In this regard, it offers essentially three "services": a nice way to access data stored in a Lua interpreter; a not so bad way to write functions in C++ and make them available to Lua; and a limited and just barely usable way to register C++ classes and objects in a Lua state.
PySide provides a full set of Qt bindings and automated binding generation tools. The binding generation tools can be useful for creators of Python bindings to any Qt-based library or to any C++ library in general. Although based on a different technical approach, PySide will initially be API-compatible with existing Python bindings for Qt.