humblebundle[.]com/software?hmb_source=navbar
I wanted to post about this one because it is likely to be confusing to many, not because of anything Humble Bundle does, but because of the dev, Skylum. They have the habit of embarking on a new software project, abandoning anything that came before. And the internet is confused about it too. SO here's some basic info on what you get for the bargain price of $25.
Skylum's latest is in preorder [since 9/2021], and is called Luminar Neo, due sometime this winter. The previous version is called Luminar AI, which may or may not continue to see any love -- Skylum customers tend to say Not, given their past experiences, but when pressed the dev said it would basically co-exist with Neo. At any rate Luminar AI is included in the bundle. So is Luminar 4, which is a decent enough app to have on hand, but info is hard to come by nowadays -- Google on Luminar 4 and you get Luminar AI, sometimes even combined as Luminar 4 AI, which AFAIK does not exist.
Aurora HDR 2019 is included -- one of the rare Skylum apps to see more than one version, since there was an Aurora HDR 2018. From my more traditionalist perspective, it's not a true HDR photo tool -- one that helps you get the best rendering of the scene you shot -- but something to ladle on the FX. [No offense intended if that's your thing.]
Photolemur is also included, which was the development forerunner to the more advanced Luminar projects. At one time it was free, but now seems abandoned -- the Photolemur site redirects to a page where you can preorder Neo. With Luminar 4 & AI, I don't imagine it's worth the trouble to even download Photolemur.
Beyond that you get an assortment of templates, LUTs, & training that you may or may not ever use.