Mintpup or Xenialdog users have an easy way to install Photivo with PPA :
ppa:dhor/myway It is Open Source and free to use.
It has the following features:
Usage
After installation you can use Photivo by just calling :
photivo
If it doesn't start, maybe your settings got screwed somehow. Clear them with:
ptClear
Gimp Integration
Photivo to Gimp
http://photivo.org/download/gimp
Copy ptGimp to your local gimp plugins folder, which is usually located at ~/.gimp-2.*/plug-ins. Now the gimp export button of Photivo will send the image in the current pipe to Gimp, including EXIF data and output colour profile. Use the context menu on the Gimp button to get full size export.
Gimp to Photivo
Sending images from Gimp to Photivo is done by a Python script. Copy the script file mm extern photivo.py to your local Gimp plugins folder, see above for the proper locations. Note: It has to be the plugins folder, not the scripts folder! You’ll find a new Gimp menu entry Filters › MM-Filters › Export to Photivo.
Beginners will not feel right at home with Photivo, there is a steep learning curve before you can master all features. And it needs a lot of processing power, so it's not for the usual Puppy on older hardware.
But we can say the same thing for most of Raw processors, such as Darktable, Raw Therapee, etc, but Lightzone is less intimidating, more user-friendly, from personal experience, and works with Puppy without too much processing powers, depending on the size of files you work with.