Photivo
Photivo is not just a photo editing application, it is also a photo processor. This application handles meta-data effectively and converts RAW format files along with usual files like TIFF, JPEG, BMP, and PNG in a non-destructive, 16-bit processing pipe. It also works with the best algorithms available in the market for organizing, sorting, and finding necessary files from the browser. This includes gimp workflow and batch mode. It also works across different platforms like Linux, Mac and Windows. Even though it has a steep learning curve, once the user is familiar with this application, then there's no looking back. GIMP workflow integration, CA correction, Green equilibration, line de-noise, bad pixel rectification, de-noising wavelets median filters of RAW data, and tone mapping are some of the commonly-used features of Photivo.
Why you must get it: 
This application has a completely new architecture of filters. Even though most  of the photo editing software provides such features, still the features provided by Photivo are advanced and more user-friendly.