The free alternatives are good, but paying a little will gain a lot...plus more likely to find support and instructional videos. While I currently use Lightroom and Photoshop, for years (since it was a 'must have' shareware) I used Paint Shop Pro. Corel keeps sending me upgrade emails. I noted a year ago that Corel had a program - AfterShot Pro. I haven't used it other than downloading a trial, but my jaw dropped. I has the look and feel of Lightroom - sliders and all, and lacked only one or two features in my quick review. Well worth downloading the trial (hidden in the "download' section as primary page only shows the purchase option).
Currently on 'sale' for $49, but seems like always on sale. Also a secondary sale "get for $20" if purchase any other program. Paint Shop Pro X5 Ultimate is $55 non-upgrade. The combination of those 2 would be dynamite. Paint Shop Pro, which does perhaps 95% of what Photoshop does, also includes the NIK plugins in the Ultimate version of X5. Frankly, while I have CS6 which will be good until I retire at which point there is no way I would consider CC's monthly obligation on fixed income. I would go to this in a heartbeat - and probably Final Cut in lieu of Premiere Pro, but would look at Corel's video option.
Original poster didn't state if using Apple or Windows. AfterShot is Mac/PC, while all others, including some discusse by others, are PC only. Would need to run in Parallel/Bootcamp on Apple, but don't know how well (i.e. sluggish) that transition is.