Perhaps you've seen the banners for it here on GameDev.net. Atomic Game Engine is a cross platform, C++ based, JavaScript/TypeScript/C# 2D/3D game engine built on top of Urho3D.
Today as part of the ongoing Closer Look game engine series we just did an in-depth review of the Atomic Game Engine. There is also a video version of the review.
Hard to just do direct comparisons like that. Unlike all of those engines, it's 2D and 3D. SpriteKit is single platform... well, single vendor, which is obviously an issue to many. Corona is mobile focused and Lua powered. If you want to target desktops, Corona is a non-starter I believe (may have changed). By Cocos I assume you mean Cocos2d-x? The big difference there, other than being 2D only, is the level you work at. Atomic has much higher level tooling support. Cocos2d-x has a VASTLY larger community.
