The best Imageboard alternative to Pinterest is Pinry, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Pinterest and four of them are Imageboards so hopefully you can find a suitable replacement. Other interesting Imageboard alternatives to Pinterest are PureRef, Google Collections and Recorant.
Pinry is a private, self-hosted, Pinterest inspired by Wookmark and built on top of Django.
Self-hosted and Open Source alternative to Pinterest with a very similar user-experience.
It's explicitly made to be an alternative to pinterest.
PureRef was created to be a simple and lightweight tool for artists to organize and view their reference images. Image can be scaled and collage can also be made.
Look for the bookmark across Google to add what you like. You can access collected items from any signed-in device
Recorant is a platform where artists can share anything as long as it's creative. Have you ever wanted to find some low view-count videos on Youtube, but couldn't because the algorithm just doesn't promote such videos?
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Pinry is a good Pinterest alternative. However, it is self-hosted, which means you will need to know how to configure the software to work on your own server. The advantage is that you then keep control of your data. Excellent project.