The latest versions of the libvirt C library can be downloaded from:
Once an hour, an automated snapshot is made from the git server source tree. These snapshots should be usable, but we make no guarantees about their stability; furthermore, they should NOT be considered formal releases, and they may have transient security problems that will not be assigned a CVE.
In the git repository are several stable maintenance branches,
matching the
pattern vmajor.minor.micro-maint;
these branches are forked off the corresponding
vmajor.minor.micro formal
release, and may have further releases of the
form vmajor.minor.micro.rel.
These maintenance branches should only contain bug fixes, and no
new features, backported from the master branch, and are
supported as long as at least one downstream distribution
expresses interest in a given branch. These maintenance
branches are considered during CVE analysis.
For more details about contents of maintenance releases, see the wiki page.
Libvirt code source is now maintained in a git repository available on libvirt.org:
git clone git://libvirt.org/libvirt.git
It can also be browsed at:
http://libvirt.org/git/?p=libvirt.git;a=summary
The guide is both a learning tool for developing with libvirt and an API reference document. It is a work in progress, composed by a professional author from contributions written by members of the libvirt team.
Contributions to the guide are VERY welcome. If you'd like to get your name on this and demonstrate your virtualisation prowess, a solid contribution to the content here will do it. :)
PDF download is available here:
The source is also in a git repository:
git clone git://libvirt.org/libvirt-appdev-guide.git
Browsable at:
http://libvirt.org/git/?p=libvirt-appdev-guide.git;a=summary
Once you've have obtained the libvirt source code, you can compile it using the instructions here.