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There’s GIMP and Krita as Photoshop alternatives
Dark Table as a Lightroom alternative
DaVinci Resolve as a video editor
Personally giving up Lightroom is the hardest IMO, the others were easy choices.
Edit: Will add links when I get to my next break at work, no time right now.
I love Gimp but I would never suggest it as a Photoshop alternative for professional users.