AppStream is an agreement between major GNU/Linux vendors (i.e. Red Hat, Canonical, SUSE, Debian, Mandriva, etc.) to create a common application installer for Linux and one unified application installation GUI and sharing of metadata.
The project describes itself as: "an initiative of cross-distro collaboration, which aims at creating an unified software metadata database, and also a centralized OCS (Open Collaboration Services) user-contributed content database, thus providing the best user experience."
 See also
- AppStream at freedesktop.org
- Project Bretzn
- Phoronix - Introducing AppStream, Multi-Distro App Framework
- Google Summer of Code 2011 - PackageKit backend and AppStream integration for Software Center
- OpenSuse's Application Manager
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