https://photoshopchef.com/fsx-plugin/

• Expert-level Frequency Separation
• FSX Plugin is the #1 tool for advanced retouching with Frequency Separation in Photoshop. It redefines how modern frequency separation should be approached - eliminating its drawbacks and introducing powerful new capabilities. FSX offers a smart, efficient workflow that’s perfect for everything from quick cleanups to high-end work - making it a must-have for every professional.