Gimp

GIMP is the leading free, open-source image editor — the practical alternative to Photoshop for anyone unwilling to pay subscription fees. Version 3.0 (released February 2025 after seven years) added non-destructive layer effects, multi-layer selection, improved CMYK support, and native Wayland support. The plugin ecosystem is large but some older plugins broke in the Python 2 to Python 3 migration.