ImpulseAdventure/GUIslice
GUIslice drag & drop embedded GUI in C for touchscreen TFT on Arduino, Raspberry Pi, ARM, ESP8266 / ESP32 / M5stack using Adafruit-GFX / TFT_eSPI / UTFT / SDL
License & maintenance
MIT is a permissive license: free to use commercially with attribution.
Last code push 3 months ago.