apt-listchanges is a tool to show what has been changed in a new
version of a Debian package, as compared to the version currently
installed on the system. It does this by extracting the relevant
entries from the Debian changelog file, and the NEWS.Debian file.
It can be run on several .deb archives at a time to get a list of all
of the changes that would be effected by installing or upgrading a
group of packages. It can be configured to do this automatically
during upgrades using apt.
At one point, Open Hub analyzed source code for this project based on code location(s) available at that time. Since then, the code locations have been removed.