uSync and uSync.ContentEdition are open source, the code is available on the main uSync 8 Github repository
Current issues and feature requests are available on the main code repository
You can access the uSync 4.x (Umbraco v7) documentation on docs.jumoo.co.uk
The uSync.Complete documentation is also on our docs site.
The latest Release Notes are available on the public issues repository
This is Included in the above documentation but we also have some starter documents for uSync.Publisher