Nokia Glance-like lock screen clock on Android
The keyword is: "Active Display". Use that in a search (a better custimized Google Search here) turns up a whole lot of good candidates (oh, and a bunch of not-candidates, unfortunately). It might be useful ignoring the ones from Motorola itself, as they are probably intended for their device(s) (checking can't hurt, though). Just a few picks right from the first page:

 
Active Display &amp; Battery Active Display are two examples of apps emulating Moto's Active Display on other devices

As I wrote, these are only the first two candidates picked up, and there are probably several more you might wish to check out for yourself. Good luck!