A new beta release is out, Catznip-R12 (Beta 2) – May 3rd 2017. The download is here. I have yet to try the viewer’s new version. I gather that beyond just catching up to Linden features the inventory features have been extended. More details are available at Catznip Blog and Catznip R12: Three Days of Teasers.
I like the inventory features being added. So, I have to decide if having a viewer for photos and machinima (Firestorm), another for latest features (Linden), and another for inventory (Catznip) is worth the effort or frustration. I would like to have all the features I use in one viewer, which just isn’t possible now. I hate being one viewer and needing a feature only in another.