AltStore is an iOS App Store alternative which doesn't require jailbreaking, and launches today with a Nintendo emulator called Delta. The software is open source and while other App Store alternatives use enterprise certificates, AltStore uses a developer feature to sideload apps.
Jide Technology has released Remix OS Player, a new Android emulator that creates a virtual Android 6.0.1 desktop within the Windows environment for free.
A developer has ported DOSBox over to Microsoft's universal app platform for Windows and shows that Windows 95 and Duke Nukem 3D can run on the Xbox One.