Vertex Oven helps you bake game-ready ambient occlusion in seconds without UV unwrapping or slow Cycles bakes. Works out-of-the-box on most meshes without any tweaks, and produces bakes far faster than Cycles. The ambient occlusion data can be used in Eevee and Cycles or exported to Unity, Unreal Engine 4, or any other engine that supports vertex colors and custom shaders.
Vertex Oven is available for $20 from Blender Market, or for free on GitHub. If you find that Vertex Oven improves your workflow, please consider purchasing it as well.