xserver

X.Org

http://www.x.org/wiki/

XFree86

http://www.xfree86.org/

tinyX

http://www.x-oz.com/tinyx.html

OneSecondX

http://fedoraproject.org/wiki/Features/OneSecondX

AsmLibx

http://sourceforge.net/projects/asmlibx/

Framebuffer UI (fbui)

http://home.comcast.net/~fbui/

DirectFB

http://www.directfb.org/

eGuiEval

http://sourceforge.net/projects/eguieval/

GtkFb

http://snap.shot.cx/ZWiki/GtkFb

Nano-X

http://www.microwindows.org/

Note

http://ja.wikipedia.org/wiki/X_Window_System

http://linuxmad.hp.infoseek.co.jp/ELGUIQRef.html

progress bar
http://tiki.is.os-omicron.org/tiki.cgi?c=v&p=LinuxFrameBuffer