The Yocto Project development team makes the Yocto Project available through a number of methods:
Source Repositories:
Working from a copy of the upstream
poky
repository is the
preferred method for obtaining and using a Yocto Project
release.
You can view the Yocto Project Source Repositories at
http://git.yoctoproject.org/cgit.cgi.
In particular, you can find the
poky
repository at
http://git.yoctoproject.org/cgit/cgit.cgi/poky/.
Releases: Stable, tested releases are available as tarballs through http://downloads.yoctoproject.org/releases/yocto/.
Nightly Builds: These tarball releases are available at http://autobuilder.yoctoproject.org/pub/nightly/. These builds include Yocto Project releases, meta-toolchain tarball installation scripts, and experimental builds.
Yocto Project Website: You can find tarball releases of the Yocto Project and supported BSPs at the Yocto Project website. Along with these downloads, you can find lots of other information at this site.