X Server is a beta release, developed by Darkside Technologies Pty Ltd, that implements a mostly-complete X11 server running natively on Android. This application allows users to run X Window System applications remotely and display them on an Android device with internet access.

It is important to note that this application does not come with a window manager, but it is possible to run a window manager remotely. Although it can be a bit difficult to do, it does seem to work. Additionally, X Server is an open-source application, meaning users can report any bugs they find or even fix them themselves.

Overall, X Server is a great option for those who need to run X Window System applications on their Android device. However, keep in mind that this is still a beta release and may have some bugs or limitations.