Esoteric has announced the general availability of their new spine-cpp runtime, an idiomatic implementation of the Spine Runtimes API for C++, making the integration of Spine in your C++ based projects a breeze.
The Spine Runtimes for Unreal Engine, Cocos2d-X and SFML have also been updated to use the new spine-cpp implementation.
You can try out the new spine-cpp runtime as well as the new integrations for Unreal Engine, Cocos2d-X, and SFML in the 3.7-beta-cpp branch on Github. Check out the CHANGELOG for information about API additions and breaking changes. The Spine-C++ guide shows how to operate the new runtime and integrate it in your custom engines.