Joy of Computing

A minimal Go AI modeled on AlphaGo. It became the basis of Minigo (https://github.com/tensorflow/minigo), which is maintained by the Tensorflow team. — davidbalbert

Bidict not only provides high-performance, industrial-strength bidirectional mapping data structures for Python, but it includes a shocking amount of computing joy to boot. Take a closer look at bidict to illuminate some of Python's lesser-known and more under-appreciated darkest corners, and discover a few surprises along the way. — porterjamesj

A GameBoy Color palette browser that uses your webcam. — davidbalbert

An extension of the brainfuck esoteric programming language that adds support for linux syscalls, and an example HTTP server written in it. — porterjamesj

A Chrome extension which enables coders to pair program over the internet and solve LeetCode.com algorithm coding challenges together. Users can type into a shared text editor and video chat in real time, all in the browser. Recursers can login using their Recurse.com account. Source Code: https://github.com/MerkleBros/leetcode-pairing-chrome-extension — Douglas Lerner

An extension of the Swift standard library's `zip` function to three lists. — porterjamesj

A remake of the classic flash game using modern web technologies. You can see the source code for the physics engine here: https://github.com/conundrumer/lr-core — porterjamesj

The asciidots visual programming language, plus emoji! — porterjamesj

A ray tracer written in Kotlin, completely from scratch with no libraries. — porterjamesj

A long form essay that shows the relationship between type systems and logic systems in type theory. — jollysonali