Android: Facebook's Chat Heads feature introduced a creative new way to carry on a conversation. A floating bubble would hover over what you do and roll up when you didn't need it. Link Bubble applies the same concept to let you open browser links while you're using other apps.
Say you're browsing Twitter and want to open up a link. You can tap on the link and Link Bubble will start to load it in the background while you keep using the app. The floating bubble can be opened and closed at will, just like Chat Heads. The free version allows you to open just one bubble from one app, while the full version ($4.99) allows you to open as many tabs as you'd like from anywhere in the OS.
Link Bubble Pro ($4.99) [Google Play Store]