LVGL (Light and Versatile Graphics Library) is an embedded GUI library written in C, providing a comprehensive widget toolkit (30+ widgets), style system, layout managers (flex, grid, split), animation framework, and multiple rendering backends (software, GPU-accelerated via VG-Lite, NanoVG, OpenGL ES, and hardware-specific backends for various MCU/MPU platforms). It is designed for resource-constrained devices with a small memory footprint (~100kB RAM for typical UIs) and supports a wide range of display drivers (SDL, Wayland, DRM, UEFI, Windows, and many embedded display controllers) and input devices (touch, keypad, mouse, gestures). The library features a public/private header pattern for encapsulation, a configurable build system via Kconfig, extensive Unity-based test suites with screenshot comparison, and a GDB plugin for runtime introspection. It is actively maintained with frequent commits, comprehensive CI/CD, and a large ecosystem of examples and demos.
openHASP is an embedded firmware framework for home automation touch panels, built around LVGL for GUI rendering. It provides a configurable dashboard for controlling IoT devices via MQTT, with support for ESP32, STM32, and other microcontrollers. The system features hardware abstraction layers for displays and touch controllers, modular services (MQTT, HTTP, FTP, Telnet, WireGuard VPN), OTA updates, and a JSON-based configuration system. It integrates with home automation platforms like Home Assistant through auto-discovery and state topics, while offering local UI interaction via touchscreen. The architecture separates concerns into HAL, GUI, networking, storage, and services, enabling cross-platform deployment.