The primary way for applications to work with a Fedora 4 repository is through the RESTful HTTP API.
In addition to working with repository content directly, many applications will work with external search engines and triplestores, which are kept in sync with the repository when updates are made.
Fedora is built with the contributions of developers just like you. If you've found a bug, or have a feature you want to add, we would love your help. Our Guide for New Developers includes links to our project resources (source code, issue tracker, mailing lists, etc.) and our Git workflow.