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Camera Viewer is a Blender add-on that previews the camera view directly in the 3D viewport. It supports locking the camera, an adjustable preview position, transformable previews, independent overlay settings, and color management.

LayerComp is a layer-based compositing add-on for Blender that works in a way similar to After Effects. It composites with AOVs, View Layer, media and more, stacking results as layers rather than adding a single filter over the screen.