Miro - Scalable, secure, cross-device and enterprise-ready team collaboration tool for distributed teams. Join 2M+ users & 8000+ teams from around the world.
Wayland - Wayland is intended as a simpler replacement for X, easier to develop and maintain.
OpenBoard - The OpenBoard software is an interactive white board software.
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.
Conceptboard - Instant Whiteboards for Teams & Projects
XQuartz - The XQuartz project is an open-source effort to develop a version of the X.