Android: Copy Bubble is a clipboard manager with a floating icon that makes it easy to copy text or images in one app and paste it in another. When Copy Bubble is active, you can copy data as you normally would. The counter on the icon will fill up as you copy more things.
When you want to access it, hit the icon and choose the appropriate clipboard item and an action — to copy it again, share it with another app or delete it.
Copy Bubble takes only 1MB of storage, but the persistent floating icon can be a dealbreaker for many people. The good news is that this is consistent feedback from many users, so the developers are working on a solution to remove the persistent icon.
It's completely free and works as advertised. If you find the persistent icon that annoying, you could shut it most of the time and access it quickly with Swipepad when needed.