A simple Blender add-on that shows what files (and what data from those files) is being linked into the current blend file.
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(This screenshot will probably get outdated pretty quick, but you get the idea)
- After installing the add-on, you'll see a panel in the Scene settings.
- This panel automatically detects what files are being linked into this file and lists them. For each file, it shows how many of each kind of data-block there is.
- Click the little arrow on the left of each library to expand a full list of data-blocks.