App Swap Drawer

The default app drawer in Android is not something that really stands out. It works, and it has a very simple job, but it's not all that interesting, and it could benefit from a few important features.
Fortunately, users don't have to look very far to find an app that can extend the functionality of the app drawer. In fact, it's quite possible to replace it completely once you get the hang of it.
App Swap lets users group apps in various categories that are identical to the ones used by the Google Play Store, but, most importantly, it allows users to open new apps without having to close the current one.
Furthermore, switching between apps is easy, and it can be done with just a swipe.