UZDoom is a modern, feature-rich source port for Doom-engine games, forked from GZDoom. It is a monolithic game engine application that provides software and hardware-accelerated rendering (OpenGL, Vulkan, GLES), a full audio subsystem (ZMusic) supporting MIDI, tracker modules, and chip emulation, a custom GUI toolkit (ZWidget) for the launcher and in-game menus, a scripting engine (ZScript/ACS) with a Debug Adapter Protocol (DAP) server, and a resource filesystem. The codebase is large and complex, with extensive third-party library vendoring (FreeType, HarfBuzz, Abseil, asmjit, etc.) and multiple rendering backends. It is actively maintained with recent commits and CI pipelines. While the architecture is well-structured with clear subsystem boundaries, the sheer volume of vendored code and platform-specific implementations introduces medium technical drift. Several components (ZMusic, ZVulkan, ZWidget, DAP debug server) are self-contained and could be extracted for reuse in other projects.