ImeSense 

Ogg media container reference implementation

FreeImage is an Open Source library project for developers who would like to support popular graphics image formats like PNG, BMP, JPEG, TIFF and others as needed by today's multimedia applications

Vorbis audio compression reference implementation

FreeType is a freely available software library to render fonts

OpenAL is a cross-platform 3D audio API

Theora video codec reference implementation

A massively spiffy yet delicately unobtrusive compression library

GameNetworkingSockets is a basic transport layer for games

FidelityFX Super Resolution 2 for DirectX 11

oneAPI Threading Building Blocks (oneTBB)

Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D

GameNetworkingSockets is a basic transport layer for games

mimalloc is a compact general purpose allocator with excellent performance

Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D

oneAPI Threading Building Blocks (oneTBB)

LZO is a portable lossless data compression library written in ANSI C

GameNetworkingSockets is a basic transport layer for games

Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D

SpeexDSP is a patent-free, Open Source/Free Software DSP library

The NVIDIA Texture Tools is a collection of image processing and texture manipulation tools, designed to be integrated in game tools and asset processing pipelines