There has been private, academic, commercial and non-profit Croquet development for a while now. Much has been internal and proprietary (and even military) and so the general public has not had a chance to see it. Less than two months ago, we cobbled up an open sample application.
Meanwhile, the folks at Qwaq have been working hard in stealth mode, building a sophisticated application and aiming to be the first clearly commercial Croquet play. Read more.