It seems that Antagonist is able to support their claims - which is new

There are many providers claiming all sorts of things. But by providing free and open source software solutions, which have proven themselves adequate or even better solutions, Antagonist supports my vision that software can be easy, open and free while at the same time providing better functionality than closed source systems. This approach protects you from a vendor lock-in, making it open to take your content anywhere, which you will not do just because Antagonist is open....