I know a lot of you have been waiting for it. I have decided to publish it as open source, because the tool has so much potential, but I have no time to work on it.
You can find it here on GitHub: https://github.com/mwiedemeyer/SPSync
Hopefully you do some cool stuff with it.
Note: I will not answer support questions via mail anymore. If you found a bug, please fix it on your own or file an issue on GitHub.