Google's Santa Tracker is open sourced and has been on the Android and web.
If you are not aware "with Santa Tracker you can in addition to watching Santa's progress as he delivers presents on December 24–—"visitors can also have fun with the winter-inspired experiences, games and educational content by exploring Santa's Village while Santa prepares for his big journey throughout the holidays."
In the annoucement, Google said they've extended, enhanced and upgraded code, and "you can see how we used our developer products - including Firebase and Polymer - to build a fun, educational and engaging experience."
Both repositories include instructions so you can build your own version.
The company notes, that the Santa Tracker Android app is a single APK, "supporting all devices, such as phones, tablets and TVs, running Ice Cream Sandwich (4.0) and up."
Also, this year, the team had simplified Chromecast support, "focusing on a great screensaver that would countdown to the big event on December 24th - and occasionally autoplay some of the great video content from around Santa's Village."