Wayland - Wayland is intended as a simpler replacement for X, easier to develop and maintain.

Off Of - A Simple Percentage Calculator for iOS

Y Window System - Y Window System is a platform that allows you to improve the speed, working, and efficiency of the application in your operating system and helps you to increase the responsiveness of applications similar to any locally based app.

Whiteboard Fox - Simple Online Whiteboard

XQuartz - The XQuartz project is an open-source effort to develop a version of the X.

Witeboard - A real-time whiteboard for your team. No signups required.