Find all packages installed with easy_install/pip?
pip freeze
will output a list of installed packages and their versions. It also allows you to write those packages to a file that can later be used to set up a new environment.
https://pip.pypa.io/en/stable/reference/pip_freeze/#pip-freeze
As of version 1.3 of pip you can now use pip list
It has some useful options including the ability to show outdated packages. Here's the documentation: https://pip.pypa.io/en/latest/reference/pip_list/
If anyone is wondering you can use the 'pip show' command.
pip show [options] <package>
This will list the install directory of the given package.