Supported
The file format libopenraw supports even partially:
Minolta MRW (starting 0.0.5)
Not Supported
The file format that are not supported due to lack of documentation, sample or resources. There is a plan to support them in the long term. Any help is welcome.
Metadata
Other references
http://crousseau.free.fr/imgfmt_raw.htm (in French, by one of the developers of DxO)
Sample Files
The internet is somewhat rich in sample files. The manufacturers however don't provide any. Some sources:
http://raw.fotosite.pl/ has a public repository of RAW files from various camera.
http://www.rawsamples.ch/index_en.php has different RAW sample.
http://www.glasslantern.com/RAWpository/ is a third source.
http://digikam3rdparty.free.fr/TEST_IMAGES/RAW/ from the Digikam team.

