There is now an ApEx project on SourceForge.net. There is also a Project Home Page, hosted on apex.oracle.com here.
According to the site, the goal of the project is to "facilitate development of Oracle Application Express (APEX) applications until they gain enough momentum of their own to become their own separate projects." Some of the initial projects include a Forum, Wiki, Blog, and AskSomeone, which if you can't tell, is based on AskTom.oracle.com.
This move represents another step in the maturity of ApEx as a development environment. As this project grows, more "cookie cutter" applications will be available for common tasks, making it even easier and quicker to deploy ApEx applications.