I've been working on a drag-and-drop neural network visualizer (and more). Here's an example of a visualization for a LeNet-like architecture. [![A visualization of a LeNet-like architecture][1]][1] [1]: https://i.sstatic.net/pRLeG.png
Models with fan-out and fan-in are also quite easily modeled. You can visit the website at https://math.mit.edu/ennui/
The open-source implementation is available at https://github.com/martinjm97/ENNUI.