Novation has introduced Launchpad Arcade – a free music app, based around loop-based remixing.
Launchpad Arcade runs in your web browser (Google Chrome recommended), and lets you play loops and sounds using a clip grid. A browser at the top right of the screen lets you select between sessions.
You can launch loops and one-shot samples with your mouse, or try finger drumming using your keyboard. And, if you have Launchpad hardware, you can connect it to your computer and use it to control the app.
In addition to being a fun free tool, you can use it to download many of the available sessions for use in Ableton Live.