Yes indeed, for a pretty comprehensive list of apps for a variety of things look here.
The following is current as of Sept 9, 2015. This is a list of the officially approved SmartApps that are available for installation through the SmartThings mobile app under the SmartApps tab. In each category, you will find a combination of community contributed & SmartThings developed SmartApps.
To install any of these, open the mobile app, select the Marketplace icon ([image]), and select the SmartApps tab.
Smart Lights by SmartThings Control and automate Lights and Switches.
Safety & Security
Notify Me When by SmartThings Receive notifications when anything happens in your home.
Enhanced Auto Lock Door by Arnaud Automatically locks a specific door after X minutes when closed and unlocks it when open after X seconds.
Severe Weather Alert by SmartThing…
One of the apps that I use is “Bright when dark and/or bright after sunset”
There should be an app in that list that will do what you want