I got in on the Kickstarter for the Abode (not a misspelling) software suite by Stuart Semple and am hoping that when they release that it at least beats Darktable. Also, Darktable is pretty great as a free alternative to Lightroom.

https://www.kickstarter.com/projects/culturehustle/abode-a-suite-of-world-class-design-and-photography-tools

Edit: I named him because he created the Freetone color palette when Pantone upped their license fee on Adobe. He also made a few paints and sells them at reasonable prices as an accessible alternative to more expensive paints.