There are several open-source and free web applications for motion graphics design that may offer features including 4K export without watermarks. Here are a few notable options:
1. **Blender**:
- **Description**: Primarily known as a 3D modeling and animation tool, Blender also has robust video editing capabilities and animation features that can be used for motion graphics.
- **4K Export**: Supports 4K export without watermarks.
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