Polly2D

Polly makes it easy to get started with C++ 2D game development using a clean, modern API.

It's not a game engine and doesn't provide any kind of visual editor. Instead, it lets you define your game architecture however you desire it, and gives you all the necessary tools to do so.

In short, it provides every audiovisual aspect necessary to comfortably make a 2D game using a pure C++, code-only approach.