Some of the open source projects I'm interesetd in and a few that I have developed.
Neural Network Vizualization
In 2015 a paper with the name "An Interactive Node-Link Visualization of Convolutional Neural Networks" was published by Adam W. Harley providing a web based tool for visualizing Artificial Neural Networks in a Convolutional Neural Network (CNN) Model.
If you are interested in learning AI, this tool is something that you should explore.
Instructions: Scroll to Zoom, Left-click for orientation, Right-click for Drag
Compelte project details and source code are available here