Quagga is still beta software and there is no officially released version.
Zebra's official web page is located at:
http://www.gnu.org/software/zebra/zebra.html.
The original Zebra web site is located at:
As of this writing, development by zebra.org on Zebra has slowed down. Some work is being done by third-parties to try maintain bug-fixes and enhancements to the current Zebra code-base, which has resulted in a fork of Zebra called Quagga, see:
for further information, as well as links to additional zebra resources.