PhotoGIMP is an open-source customization patch for GIMP 3.0+ developed by Brazilian blog Diolinux that transforms GIMP's interface to match Adobe Photoshop's layout, shortcuts, and design. It enables Photoshop users to transition to the free GIMP editor without losing productivity or workflow familiarity, remaining fully compatible with plugins and customizable on Windows, macOS, and Linux.
Compositor is a free, open-source image editor for Mac designed as an alternative to Adobe Photoshop, built around compositing and post-processing workflows. The creator developed it to provide a full-featured editing tool without Photoshop's cost, with the flexibility for users to customize features via its open-source codebase.