4.2 Who wrote all that software?
For each package the authors of the program(s) are credited in the
file /usr/share/doc/PACKAGE/copyright, where PACKAGE is to be
substituted with the package's name.
Maintainers who package this software for the Debian GNU/Linux system
are listed in the Debian control file (see What is a Debian control file?,
Section 6.4) that comes with each package. The Debian changelog, in
/usr/share/doc/PACKAGE/changelog.Debian.gz, mentions the people
who've worked on the Debian packaging too.