Through June 30th, DxO is offering free activation licenses for DxO OpticsPro 9. Granted, DxO OpticsPro 11 is the current version, but... you may find DxO OpticsPro 9 a great option if you own a DSLR that's a couple of years old do not want to invest in an alternative batch editing program (like Lightroom).
You can learn more about DxO OpticsPro 9 via press release or find its supported cameras here.