Compositor

Compositor is a free, open-source image editor for Mac, built specifically around compositing and post-processing. It targets photographers and designers who find Adobe Photoshop too expensive but feel that tools like GIMP break their workflow. The interface and toolset are designed to feel familiar to Photoshop users without the subscription cost.

The core focus is pixel-perfect compositing. That means the feature set isn't spread thin across illustration or vector work; it's concentrated on what you actually need to combine, retouch, and finalize images.

Key capabilities include:

• Layers and folders for organizing complex compositions
• Layer masks and clipping masks for non-destructive editing
• Blend modes to control how layers interact
• Selection tools for isolating subjects and regions
• Adjustment layers for color and tone corrections
• Background removal built directly into the app
• Filters including Gaussian blur, motion blur, and lens correction
• Grain and noise for adding film-like texture
• Liquify and smear for warping and reshaping
• Spot healing and clone stamp for retouching
• Brush tool for painting and touch-ups

Because the full Xcode project is available, you can add, remove, or modify any feature to suit your needs. That's a meaningful difference from other photo and video editors in this space: the source is genuinely open and buildable, not just visible. Mac-only by design, so it takes full advantage of the platform rather than trying to be cross-platform everywhere.