Windows Alternatives

Creative Apps

Krita https://krita.org/en/download/

GIMP https://www.gimp.org/

FireAlpaca https://firealpaca.com/

FTP Clients

FileZilla https://filezilla-project.org/

Media Players

VLC https://www.videolan.org/

mpv https://mpv.io/

Foobar2000 (requires Wine, works well) https://www.foobar2000.org/windows

Gaming

Shadowplay

GPU Screen Recorder https://flathub.org/en/apps/com.dec05eba.gpu_screen_recorder

Epic Games/GOG/Amazon Games

Heroic Games Launcher https://heroicgameslauncher.com/

Logitech Mice

https://flathub.org/en/apps/io.github.pwr_solaar.solaar

Corsair Devices

https://github.com/ckb-next/ckb-next

RGB Software

https://openrgb.org/