Discourse is the 100% open source discussion platform built for the next decade of the Internet. It works as:

a mailing list
a discussion forum
a long-form chat room

Framer.js is an open source JavaScript framework for rapid prototyping. Framer.js allows you to define animations and interactions, complete with filters, spring physics, 3D effects and more. It's bundled with Framer Generator, an application that allows you to import layers directly out of Photoshop and Sketch.

Smooth parallax effect on vertical page scrolling

A Field Type plugin for CraftCMS that allows the management of relationships from both sides

A sublime plugin to show difference between 2 files. It supports both Sublime 2 and 3.

A simple Google Apps script to convert a properly formatted Google Drive Document to the markdown (.md) format.