LiveBoot

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LiveBoot is a really useful application from Chainfire that allows users to see everything that’s happening during the boot process. Read more about LiveBoot  

The loading process for the operating system on your phone or tablet is usually accompanied by a beautiful animation and that’s pretty much it. You don’t see anything that’s happening in the background, and you can’t know if something went wrong, for example.
 
With LiveBoot that’s no longer the case since the user now has access to the logcat and dmesg outputs on-screen as they happen. The output is color coded, which means that it’s easy to understand what's going on, not to mention that the background can be set to transparent to overlay the existing boot animation.
 
Of course, in order to use LiveBoot user will need to have root access on their devices and they need to have SuperSU 2.40 at least.