DirectFB
Mir
Y Window System
Wayland
Xynth Window System
Metisse
XQuartz
xmodmap
SourceForge
GitHub
GitLab
BitBucket
openDesktop.org
Gitea
Launchpad.net
OSOR
DirectFB
SourceForgeMir - The purpose of Mir is to enable the development of user interfaces shells.
GitHub - Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.
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.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Wayland - Wayland is intended as a simpler replacement for X, easier to develop and maintain.
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.