SBCL hosts its code at git://git.code.sf.net/p/sbcl/sbcl.
You can learn more at the project's web page.
Launchpad imports the master branch and you can create branches from it.
bzr branch lp:sbcl
SBCL has 1 active branch owned by 1 team. There were 56 commits by 5 people in the last month.