CGJackB

Silhouette Thumbnail - Live Shape Preview adds a realtime, viewport-independent silhouette window to Blender, letting you check shape, pose, and readability while modeling, sculpting, posing, or animating, without changing your camera, materials, or viewport shading.

Turntable Viewport is a lightweight Blender add-on that keeps a live spinning preview of your model in a separate 3D viewport while you keep working normally in another. Only the marked preview viewport orbits.