This is a standard Magento installation that I use for testing popular module's compatibility with Magento:
- Modules and their versions are managed through composer.
- Modules are picked by their popularity, though due to this repository being public there will be no paid extensions.
Sure:
- Modify composer.json to add your module as a dependency.
- Ensure that your module cleanly installs and doesn't add any rewrite conflicts.
- Create a pull request.
Byte Internet has been nice enough to provide a list of most popular repositories and are sponsoring some of my work on HHVM.