Dear ImGui is a production-grade, immediate-mode graphical user interface library for C++. It provides a self-contained core engine (rendering, widgets, tables, fonts, input handling) and a large ecosystem of platform and renderer backends (GLFW, SDL2/3, Win32, Vulkan, DirectX, Metal, OpenGL, WebGPU, etc.) that enable integration into any application with minimal overhead. The architecture is a library with pluggable backends: user code calls ImGui::NewFrame() to build UI, then ImGui::Render() produces draw data consumed by the chosen renderer backend. The repository includes dozens of example applications demonstrating integration with various windowing systems and graphics APIs, as well as utilities like font embedding tools, FreeType rasterizer integration, and a headless backend for testing. It is not a data research project; it is a software library for building tools, debug UIs, and in-game overlays.
This repository is the well-known stb single-file public domain C/C++ library collection by Sean Barrett. It contains over 20 self-contained header-only libraries covering a wide range of functionality: image loading and writing (stb_image, stb_image_write), image resizing (stb_image_resize2), TrueType font parsing and rasterization with signed-distance fields (stb_truetype), Ogg Vorbis audio decoding (stb_vorbis), dynamic data structures (stb_ds), high-performance formatted output (stb_sprintf), rectangle packing (stb_rect_pack), text editing widget logic (stb_textedit), Perlin noise (stb_perlin), voxel rendering (stb_voxel_render), tilemap editing (stb_tilemap_editor), and many more. Each library is designed to be dropped into a project by including the header and defining an implementation macro in exactly one source file, requiring no external dependencies beyond standard C libraries. The repo also includes extensive test programs, fuzzing harnesses, and demo applications (e.g., a Minecraft-style voxel viewer, font oversampling demo). It is widely used in game development, tooling, and embedded systems due to its ease of integration and permissive licensing.