TellMeWeatherNow!
In September, 2014 I solved a challenge for selection of GopherConIndia 2015 scholars, I had to create a web based application for showing Weather updates for 5 cities concurrently, in Golang using Go Routines for concurrency.
I did got selected as a Student Scholar. You can view the code on GitHub.
Google App Engine with Go
I used an online weather API available freely for use, for fetching the data. Go Routines made it possible to fetch the data concurrently and load them asynchroniously on the results page.