Domainerator was my first Go application. It combines two wordlists (prefixes and suffixes) and a list of TLDs to form domain names and check their DNS status. It outputs a file with each combined domain name and the respective DNS status.
Not a long one, but...
I've developed it after getting tired of trying to find some good domain names available to be registered. In the beginning it was a slow Ruby script that still can be found as a rubygem with the same name, and now I've ported it to Go and made a lot of improvements in the method used to check for availability and speed.
I was able to run a check with 2,288 domains in about 13 seconds using 100 goroutines in a MacBook Pro Late 2008!
To install domainerator you need:
sudo go get github.com/hgfischer/domainerator
To update domainerator you need:
sudo go get -u github.com/hgfischer/domainerator