Library
p5.geolocation looks like a really cool and useful library for many projects; given how much / reliant one's location is these days, I can imagine a handful of projects where I would want to be able to use a library like this to further my capabilities with them.
Example
I really liked the soft body example shown on p5.js because it offers a lot of different ways to be able to transition from one thing to another in a very smooth and in an aesthetic pattern that I feel like I may want to use.
Glitch
The square-connect app looks like a very useful thing to have as the company square becomes more and more popular for sellers to have in their back pocket. It also have a very simple application to use, and I think more people can take advantage of it.