Focus: a lightweight UI framework for resource-constrained embedded systems, inspired by NeXTSTEP’s AppKit

Per Adafruit Blog, developer Joey Castillo has released Focus, an open-source C plus plus framework designed for resource-constrained devices like the ESP32. It replaces fragile, custom Arduino sketches with a robust, object-oriented design that runs on hardware with limited RAM. The project draws inspiration from classic Apple interface environments, bringing a more structured approach to embedded systems development.

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