LinuxBIOS keeps its development tree in a Subversion repository. If you do not want to use Subversion, please have a look at the Snapshots section below.
You can check it out as follows:
Access for developers is very similar to anonymous access. Just add your subversion username as follows when checking out the repository:
$ svn co svn://<username>@openbios.org/repos/trunk/LinuxBIOSv2
Subversion has commands very similar to CVS.
Source code browsing
You can also browse the LinuxBIOS subversion repository online.
There is an archive of snapshots available at snapshots.linuxbios.org. There is a .bz2 tar file that gets updated when the repository changes. Older snapshots are maintained as well.
You can download the most current snapshot directly.
More on Subversion
LinuxBIOS was using arch before subversion. Those older instructions are here: Download LinuxBIOS oldarch.