Sandspiel

made by Max Bittker, submitted by porterjamesj
This falling-sand game makes some beautiful emergent visualizations.

A tiny spreadsheet

made and submitted by davidbalbert
A simple spreadsheet that runs in the browser. It supports arithmetic formulas and cell references in under 600 lines of JavaScript and CSS.

Steganocats

made by Jake Davis, submitted by porterjamesj
Hide secret messages in pictures of cats

Compyler

made by rodarmor, submitted by porterjamesj
A compiler from a subset of Python to WebAssembly

touchscreen-instrument

made by shahn, dan, submitted by porterjamesj
It was so fun watching this live at RC!

The Antiquated Omi

made and submitted by mouse
A novel in collaboration with Ernest Hemingway and the Wordnik API

Existential Quantification in Type Theory

made and submitted by dk
An outline of how to think about the existential quantifier as it is encoded in higher order type theory.

Margin Notes

made by geoffreylitt, submitted by porterjamesj
A tool for automatically generating documentation from the recorded behavior of a program.

Gitlet

made by maryrosecook, submitted by jollysonali
Gitlet is an implementation of Git in JavaScript. It's a wonderful example of building a project with the intention of learning.

My First Emacs Commit

made by nickdrozd, submitted by rachel
Nick describes his first commit to "real-deal core GNU Emacs," with some interesting commentary and historical context.