A fun visualization using p5. Invisible circles, each with a color, coming out from the center of the drawing, evenly spaced. When a circle goes past the edge, it comes back in from the other side. Draw a line between the centers of overlapping circles colored the average of the circles' colors, lighter when further apart, heavier when closer together.
Code here: https://github.com/paul1peng/center
An app for creating crossword puzzles that encodes the clues and answers in the URL, storing nothing on the server. The screenshot is from an RC-themed puzzle and the code is here: https://github.com/patrickweaver/crossword
Pull data from your own computer or from the cloud and display it however it's most useful to you. Read more about Matthieu's process building it here: https://thevaluable.dev/programming-side-project-example-devdash/.