VirtualAPK is a powerful yet lightweight plugin framework for Android. It can dynamically load and run an APK file (we call it LoadedPlugin) seamlessly as an installed application. Developers can use any Class, Resources, Activity, Service, Receiver and Provider in LoadedPlugin as if they are registered in app's manifest file.
VirtualApp is an open platform for Android that allows you to create a Virtual Space, you can install and run apk inside. Beyond that, VirtualApp is also a Plugin Framework.
Android Dynamic Loader is a plugin system. The host application is like a browser, but instead of loading web pages, it loads plugins which could be run natively on Android system.