A standalone server that is both an X server and a Spice server. Iow, you get a new DISPLAY to launch X clients against, and you can view and interact with them via a spice client.
Released, now part of xf86-video-qxl. Download
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Bugs for Xspice are reported against the xorg-x11-drv-qxl component due to technically the Xspice server being part of the xf86-video-qxl driver tarball, and should all have Xspice in the title: https://bugs.freedesktop.org/enter_bug.cgi?product=xorg
Bug in handling server reset. Not yet fixed. Workaround: run with xspice "-noreset" flag (it is passed to Xorg and does just what it says - no reset when last client leaves. Meaning you have to explicitly kill the Xorg, by Ctrl-C or a signal).