@Dero_10 I have tried DarkTable and was not impressed with the amount of work/time required to get the same results as LR. Granted, I haven't tried the latest version which reportedly has major updates to the GUI.
ON1 is also a cheaper alternative, but for landscape photography I'm always disappointed with its colors and sharpness of JPEG exports.
I used to use only Canon's DPP and got great results for free. But then it turned into a slow POS.
Next on the list to try is DxO PhotoLab.