
Description: FLTK (pronounced 'fulltick') is a lightweight, cross-platform C++ GUI toolkit for developing graphical user interfaces (GUIs). It provides modern GUI functionality without the bloat, supports 3D graphics via OpenGL, and works on Linux, Windows, and macOS.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Dear ImGui is an open source immediate mode graphical user interface library for C++. It is easy to use and integrate into games or applications to create fast graphical user interfaces with minimal code.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API