Geeqie is a lightweight image viewer. It was forked from GQview. The development is focused on features for photo collection maintenance: raw format, Exif/IPTC/XMP metadata and integration with programs like UFraw, ImageMagick, Gimp, gPhoto or ExifTo
The current development and project can be found on http://www.geeqie.org/. The sourceforge page will be deleted soon.
Add a 'filter filenames' (just helpful, there is in all applications), and do what you want with the 'Marks options' (clumsy).