A drop-in replacement for the src.zip shipped with Oracle Java 7, that contains sources to all Java classes that are shipped or generated by the OpenJDK project (the official src.zip only covers public classes), plus tools to generate it.
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.