OpenRaster is an open interchange format for raster-based applications. It is being developed as part of the create project (create.freedesktop.org).
Here on Ohloh, this project basically consists of the code that goes into common repositories in the openraster.
A lot of work is in of course done in the individual applications supporting OpenRaster.
See the homepage for more information.
At one point, Open Hub analyzed source code for this project based on code location(s) available at that time. Since then, the code locations have been removed.