Using GIMP: Correcting and Touching Up Your Images - GIMP 2.6 for Photographers: Image Editing with Open Source Software - page 73

Delete
Click the Delete button to open a window with the RAW file and all other files
with the same name but a different filename extension. Here you can delete
any files you might want to delete.
2.2.3 RawTherapee for Developing Raw Images
Figure 2.14
RawTherapee's program screen offers many options and seems a little cluttered at first. The program offers a row of functions that are
available in GIMP but not in UFRaw. In RawTherapee, you can perform all the steps in 16-bit color depth per channel.