GLFW (version 3.3.8) is a cross-platform software library for creating windows, contexts, and handling input events in OpenGL, OpenGL ES, and Vulkan applications. The software features include creating windows with customizable attributes, handling keyboard, mouse, and joystick input, managing multiple monitors, supporting high-DPI displays, and providing time, error, and version information. The library also supports platform-specific extensions, such as DirectInput and X11.