coreboot provides no binaries, but there exist some distributions that do so, see below.
There are source code releases on http://coreboot.org/releases/
Accessing the source code through git
coreboot uses git and gerrit for source code management. Please see the Git page on how to work with git and gerrit in coreboot.
Previously the project used the subversion SCM, some links to it may still be referred to, but are definitely outdated.
Source code browsing
While not officially part of the coreboot project, there exist some projects that distribute pre-built (tested) ROM images along with build scripts and user-focused documentation. These "distros" of coreboot will also typically include copies of the source code (or links where to find it) for the version of coreboot used along with payloads such as SeaBIOS, GRUB and so on.
- Deblobbed coreboot, officially supporting a handful of devices.
- Provides coreboot images for several Chromebooks
Repositories on coreboot.org
coreboot current Git tree:
coreboot v1 (obsolete):
coreboot v3 (obsolete):