Tradeshift announced that they were open-sourcing their ABinator, a tool developed for A/B testing.

Tradeshift has been an active and open follower of the lean startup management philosophy, and this is another way of giving to the community. With lean startups emphasis on learning and testing, the A/B testing software will be put to good use. The tool will be hosted on github and be freely aviable. Read more on Tradeshifts blog.