CACAO development takes place on Bitbucket:
https://bitbucket.org/cacaovm/cacao-staging
See also the Contributing wiki page.
The previous repository location is still being kept alive for a while.
The URL for anonymous read-only access is:
$ hg clone http://mips.complang.tuwien.ac.at/hg/cacao
Write access to the repository is only available for project members via SSH.
$ hg clone ssh://cacao@mips.complang.tuwien.ac.at/hg/cacao
cacaojvm.org