https://www.apt-browse.org/

APT Browse -- know your packages

A web browser for the contents of Debian (and Ubuntu) packages.

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List Contents

View the list of files included in any deb package, including users
and modes.

Stop installing php5 to figure out whether config files go into /etc/
php/conf.d or /etc/php5/conf.d.

Inspect Files

View full file contents for any non-binary file.

Need to work from the default configuration in that chef template of
yours (or that sed call in your Dockerfile)? Just look it up.

And more

Navigate dependencies, view maintainer scripts.

See exactly what dpkg runs behind the scenes when you install
postgresql .

APT Browse - Built by Thomas Orozco.