At least for amateur/hobby work, I've used the following for years and love them. I also try to regularly donate to them.
Instead of Illustrator for drawing, use Inkscape https://inkscape.org/ and/or Krita https://krita.org/en/.
Instead of Lightroom for developing digital photos, use Darktable https://www.darktable.org/
Instead of Photoshop for touchups, use GIMP https://www.gimp.org/.
Instead of Acrobat Reader, use MuPDF (mobile) or Atril https://wiki.mate-desktop.org/mate-desktop/applications/atri... (Linux)