Selecting the "Filter Options" link from the top right hand corner of any category page will now reveal four more choices. A "Repositories" section has been added with four options. Selecting none or all will display any app, regardless of availability, which is what the display has previously been. Additionally, you can now filter by Debian, Ubuntu, other deb repositories, or no repository. Hopefully this will continue to improve the ability to use the site for finding useful Linux apps.