There are existing ones:
Canons DPP
Adobes ( new) lightroom
and for Nikon Users Capture NX
Aperture (for mac users)
But DXO is particularly good for correction of CA ect
Otherwise these are all tools which require a time investment to master. The differences lie not so much in quality of output but how you get on with them
Excellent 3rd party plug ins for Photoshop exist which are just as good as DXO but may be costly and less well known outside the "industry"
I do not think any of these software packages has a "best" and like Photoshop CS2, the much better featured ones take a longer time to become proficient in
For most regular uses, we probably use 20-30% of power on tap unless you are a Pro and highly demanding of first class results.This would almost invariably have been preceded by high grade kit and Pro "raw material" ( notice the pun??

)
If that is the case you may have different 3rd party paid for plug ins and ancillary tools to get you there.
The search for the holy grail of Cameras lenses and software are interesting but in real world situations you may find that your needs are simpler to meet
