Visit the website for more information about Aurora and check out the support page if you have any questions.

Go to the Additional Content tab in Aurora, enter the URL of the index file, and have Aurora download the content to the custom folder for you. When these files get updated, Aurora will be able to keep content files up to date automatically.
More information about extending the content can be found here.

• https://raw.githubusercontent.com/aurorabuilder/elements/master/core.index
• https://raw.githubusercontent.com/aurorabuilder/elements/master/supplements.index
• https://raw.githubusercontent.com/aurorabuilder/elements/master/unearthed-arcana.index
• https://raw.githubusercontent.com/aurorabuilder/elements/master/third-party.index
• https://raw.githubusercontent.com/aurorabuilder/elements/master/homebrew.index

A collection of community driven content can be found here this includes homebrew content posted on reddit and dnd wiki. Be sure to include the new index files when you're using homebrew content from any of these sources.

• Reddit
• D&D Wiki

You can request content by creating an issue in the appropriate repository with the request.
No guarantees, people create content in their free time.