DxO is having another promo, giving away an older version of their Optics Pro app -- I've seen it on SOS.
What it is...
Usually better cameras, cell phone cameras, & scanner software can save images in a normally proprietary RAW format. What the RAW format means is that all or most all of the data the sensor captured is included -- not a processed picture. The Why is because automatic processing of sensor data usually works well enough, but it's a matter of luck whether or not that automatic processing did the best possible job.
Now an app like Zoner can open RAW photos, but to do that most all image editing apps perform an automatic processing step to turn RAW data into a photo -- what's the point? Apps like Adobe Lightroom [the 900lb gorilla], Dxo Optics Pro, & Corel's Aftershot let you work with all that RAW data. If you use Lightroom, you can batch process collections of RAW images, with all changes recorded in a sort of script, so every change is still removable or adjustable, forever. And once *you* are done processing an image, it can go into Photoshop, where many of those changes can still be edited, changed, removed etc., as you further edit an image in this optional step.
At the same time, because a group of shots all taken at the same time at the same location usually shares common characteristics, like the amount of light & it's color temperature, it makes sense to use batch processing when you need to adjust or alter those shared characteristics. If the lighting added a tint, you want to remove that tint in each photo that has that tint. Because the software deals in batches or groups, it makes sense that they'd also work to catalog & organize your photos, & they do.
DxO made it's name testing and cataloging the characteristics of various lenses -- Optics Pro can in many cases automatically compensate for stuff a lens typically does wrong, like add distortion. So can Adobe's software, & to a lesser extent, Corel's. Lightroom is king in terms of numbers, and very production [speed] oriented. An art photographer OTOH might prefer DxO, which can also save edited RAW photos in a generic rather than proprietary RAW format. Corel is still trying to break into the game.
For the average photographer I'd suggest Lightroom rather than latest version of Optics Pro, because if nothing else there's a Lot more info out there on how & why to use it. If you have RAW image files though [neither Lightroom, nor Optics Pro, nor Aftershot offers much if you've got jpgs], checking out this free, older version can't hurt, & you may find something you like. It is a decent app.