WizMouse - WizMouse makes your mouse wheel scroll the window under the mouse even if it's not active. You no longer have to click a window to scroll it.

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

Key Manager - ATNSOFT Key Manager, Key Remapper, Text Paster

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.

X-Mouse Button Control - XMouse Button Control (XMBC) allows you to create application and window specific profiles.

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