PixelLight is an open-source 3D application framework designed for cross-platform software development. It offers a flexible and modular architecture to facilitate the creation of interactive 3D applications. The framework supports various platforms and provides a range of features such as scene management, real-time rendering, physics integration, and more. Developers can use PixelLight to build applications for diverse domains, including simulations, games, and virtual reality environments. The website provides resources for downloading the framework, documentation for developers, and community support for contributors and users.