Gmail, Maps, Street View, YouTube are pre-installed on most Android devices. But there are apps comes with your mobile, some you need to install separately. Here is a list of my favorite apps. I also make a remove/disable list and share my preferred configuration.
The USB Tethering between my Asus Wireless Router RT-AC51U and Sony Xperia C3 which is runningAndroid 5.1.1 drops about every 30 minutes. And I also found the “Data Usage” in Settings always crashes every time I launch it after experiencing the unusual drop. Therefore, I assume they are related.