The most popular is the Dog Feeder skill which has even been featured in USA Today and is being used by thousands of individual users every week.
Another skill from Underscore Research implements advanced Alexa support for the Nest Thermostat.
Launched several skills for Amazon Alexa
Underscore Research LLC 
Why was the Nest to Alexa discontinued? That’s why we bought the Nest and Alexa so we could control our nest from the den! I am so disappointed!
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The Alexa has built in support for the Nest provided by Amazon. Just go into the Alexa app and set it up and you should be good to go. The built in thermostat support also has slightly better natural language support since you don’t have to preface everything with “Ask Thermostat Controller…”.
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