This app was mentioned in 6 comments, with an average of 2.17 upvotes
Definitely the Zenwatch Manager app. It's made by ASUS and it comes with around 50 customizable watch faces that are made by ASUS for the zenwatches. They also do this neat thing where they will have a seasonal theme for watch faces (like right now they have christmas themes) that look pretty nice.
In addition to watch faces, the app comes with a few tools like remote phone call control (it lets you toggle speaker mode for your phone after answering a call, etc). This is basically a must-have app for zenwatch users, imo.
It's the same bundle identifier as on the watch.
https://play.google.com/store/apps/details?id=com.asus.watchmanager&hl=en
package:com.asus.watchmanager
Doesn't that mean it's the same application?
EDIT:
[parker@e73 ~]$ /opt/android-sdk/build-tools/23.0.3/aapt d badging testf/AsusWatchManagerWear/AsusWatchManagerWear.apk | grep package:\ name package: name='com.asus.watchmanager' versionCode='1900000' versionName='2.0.0.160120' platformBuildVersionName='6.0-2438415'
[parker@e73 ~]$ /opt/android-sdk/build-tools/23.0.3/aapt d badging .config/Raccoon/archives/default/apk_storage/com-asus-watchmanager/com_asus_watchmanager-1901530.apk | grep package:\ name package: name='com.asus.watchmanager' versionCode='1901530' versionName='2.6.0.4_160325' platformBuildVersionName='6.0-2166767'
It appears the Play Store version is just slightly more up to date but it's the same application. So you can pull the Play Store version and install to the watch directly with adb.
It's back online: https://play.google.com/store/apps/details?id=com.asus.watchmanager
It's back online guys https://play.google.com/store/apps/details?id=com.asus.watchmanager
The feature on the ASUS page are apps. I don't know about the imgur picture.