Kinda, Amazon purchased the code and forked it as Lumberyard. Then they realised their own studios didn't want to use it and their game-dev projects failed, so they donated the engine to the Linux Foundation.
But the engine didn't even support Linux yet, so they spawned a new Open 3D Foundation for it, and renamed the engine Open 3D. I haven't heard of anyone using it seriously yet.
Actually, before Lumberyard was released, Crytek had already open-sourced Cryengine and gave it away under a pay-what-you-want model until the engine's 5.5 release.
