MapBox announced their open source iOS virtual globe named MapBox Earth.
From the announcement: "We just launched MapBox Earth, a free and open source iOS app that combines the power of a 3D globe with MapBox’s beautiful maps. It’s also a great starting point to build your own 3D mapping app - we’re cracking the 3D globe software market wide open by releasing the source code and building in the open. MapBox Earth is a universal app optimized for iPhone and iPad and it includes beautiful preloaded layers based off of MapBox Streets, MapBox Terrain, and MapBox Satellite. You can switch the map layer with a single tap and feel the maps right in your hands, in gorgeous and fast 3D."
We did mention some other open source virtual globes in the past months / years, such as Glob3 Mobile, the Godzi WebGL Globe, OpenWebGlobe, WebGL Earth, and there's even the Google open source 'WebGL Globe'.