Photon Micro GUI

Open-source, resolution independent GUI library in C++

AudioKit

Audio synthesis, processing, and analysis tool.

A multi-platform .NET UI framework

FMOD is a proprietary audio library that plays music files of diverse formats on many different…

fox-toolkit.org

JUCE is a wide-ranging C++ class library for building rich cross-platform applications and plugins…

Fast, modern C++ framework for Digital Signal Processing (DSP).

A free and modular front-end framework for developing fast and powerful user experiences.

OpenAL Soft is an LGPL-licensed, cross-platform, software implementation of the OpenAL 3D audio API.

PortAudio is a cross platform, open-source, audio I/O library.

C++

RtAudio is a set of C++ classes that provide a common API for realtime audio input/output across…

Build Mobile, Desktop and WebAssembly apps with C# and XAML.

Game audio engine, designed to give artists more control and save programmers’ time.

wxWidgets: Cross-Platform GUI Library