From their website:
Phatch is an user friendly, cross-platform Photo Batch Processor and Exif Renamer with a nice graphical user interface. Phatch handles all popular image formats and can duplicate (sub)folder hierarchies. Phatch can batch resize, rotate, apply shadows, perspective, rounded corners, … and do much more actions in minutes instead of hours or days if you do it manually.
Here is the x86_64 txz: phatch-0.2.7.1-x86_64-1mb.txz
The associated build files can be found here: http://people.salixos.org/maximus/phatch/0.2.7.1/
Requires python, wxPython and pil, all available via gslapt/slapt-get.