http://www.go.cd/2014/02/25/go-moving-to-open-source.html
ThoughtWorks have been industry acknowledged experts in everything related to the practices of Continuous Integration and Delivery throughout the last decade. They were the creators of CruiseControl which was a de-facto standard tool for CI before all the new tools arrived. Neverthless their own commercial Conitnous Delivery platform named ‘Go’ has never come close to the popularity of even Bamboo or TeamCity ( not to mention Jenkins ).
Two days ago they announced they are making Go open-source, obviously as an attempt to increase market share. I gave GO a test-drive a couple of years ago and it seemed like a good tool back then. Now it’s open-source I’ll definitely want to look at it again. I promise to update on my impressons.