Documentation is key to your project and the wiki tool helps make it easy for anyone to contribute.
SVN, Git and Mercurial will help you keep track of your changes.
Bugs, enhancements, tasks, etc., will help you plan and manage your development.
Use the largest free, managed, global mirror network to distribute your files.
Follow the download trends that enable you to develop better software. (Comes with Downloads)
Collaborate with your community in your forums.