This application implements a mostly-complete X11 server running natively in Android. It allows X Window System applications to be run remotely and displayed on an Android device with internet access.

Note that this application does not come with a window manager. However it is possible to run a window manager remotely which is fiddly but seems to work.

This is still a beta release so feel free to report any bugs you find or better yet fix them yourself. Yes it's open source hosted at http://code.google.com/p/android-xserver/