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cvat
Discontinued Annotate better with CVAT, the industry-leading data engine for machine learning. Used and trusted by teams at any scale, for data of any scale. [Moved to: https://github.com/cvat-ai/cvat]
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CVAT has an open source repo under MIT license: https://github.com/opencv/cvat I've not worked with it directly but it might be a good place to start.
Also, a lot of image annotation is quite similar to vector editing and white boarding, so depending on what you need you might be able to adapt something like https://github.com/excalidraw/excalidraw (also MIT) for your purposes.