Like many professional software companies, we (AndEngine) use open source software. Now only that, but we also support and encorage it.
Therefore we are more then happy to publish the source code of open source software we use.
Our modificiations were of course also sent to the original manteiners as we hope our changes can be used by others.
Nevertheless the exact version of all open source software will always be avaliable below:
And Engine – Android Fireworks/Bunny Shooter version
And Engine Physics Extension – Android Bunny Shooter version