After careful consideration, Linden Lab has decided to cease development and support for dio, Versu, and Creatorverse. We’re grateful for those who took the time to experiment with these products in their early days, but ultimately we have determined that due to a number of factors, we and our customers will be best served by focusing our efforts on continuing to provide exceptional service and compelling new experiences for the users of our other products.See: http://lindenlab.com/releases/linden-lab-refocuses-product-offering
Of these, only Versu had any sort of following. Enough so that the original developer, Emily Short, tried to get the source and IP rights back. See: http://emshort.wordpress.com/2014/02/20/post-linden/ She was not successful.