I have developed four apps for Garmin wearables.You can find them in the Connect IQ Store. Most watches are supported, drop me a line if you'd like me to add your device.
DWatch records activities and reports current sensor information on your activity. You can configure the application to meet your needs.
MegaTime provides a watchface with easy-view time and health stats. It is also highly configurable.
MyBattery keeps tabs on your current charge state.
NASA PoD NASA's pic of the day
Charge Monitor Monitor your device while charging