Handy places:
Code is in Github at https://github.com/brooklyncentral/brooklyn
Issues are also on Github at https://github.com/brooklyncentral/brooklyn/issues
Maven repositories are at http://developers.cloudsoftcorp.com/download/maven2/ for releases and http://ccweb.cloudsoftcorp.com/maven/libs-snapshot-local/ for snapshots (under io/brooklyn)
CI server is currently a private server managed by Cloudsoft. There is a proposal to move to CloudBees.