This addon displays rendered thumbnails above shader nodes.

Also available on Gumroad.

• For each node, a preview thumbnail is rendered
• On edits, all affected nodes are automatically updated
• Previews are rendered in a background process to keep the Blender interface fluid and responsive
• No changes are made to the .blend, others without the addon can still open your scenes without problems
• High-resolution displays supported (works with Blender's resolution scale feature)

Caveats

• To show previews for packed images, the .blend file has to be saved to disk first, because they are loaded through linking from the .blend file
• Thumbnails of image sequences are not updated when changing frames
• IES nodes are currently not supported

About Me

I am the author of the Blender addon for LuxCore. In 2014, I started working on Blender addons by contributing to the LuxRender addon. NodePreview is my second commercial addon after ImageNodePreview: https://blendermarket.com/products/image-node-preview