Ray Casting
This was a very interesting concept, and could add a whole new depth of interactivity in fields like VR or AR. As an enthusiast in those fields, this example provided some inspiration for what I can achieve in 3D (specifically with p5.js).
P5.scribble
This library adds even more direct interaction with the user, and creates a friendly environment where the user can communicate with the machine, where the machine has to interpret individuality in users, forming a basis for machine learning capabilities.
Cesium Viewer
Has applications for large scale 3D projects and immense attention to detail, which is useful especially in VR/AR projects trying to emulate the experience of the real world.