All the packages in the software repository should include a URL hyperlink to the official website of the software.
So when you read about the software, you can click on the link to get to the official homepage, for more information.
Developer comments
This is in progress: The latest packaging rules explicitly ask to add the homepage URL of the software to the package. You can already see the homepage URL of some packages in Hardy Heron via the "Add/Remove applications" program.