Members of the Viverra family are, so far, pretty limited. If you build an app using Viverra, please let me know and I'll list it here!

• FerretBrain
  To quote from its home page: “FerretBrain is an easy-going, irregular e-zine about stuff. If you're excitably eclectic, curiously cantankerous, articulately adventurous (although not necessarily adverbially alliterative) and unduly attracted to shiny things this could be the place for you.”
• necaris.net App Central
  I've written a couple of vaguely useful (often one-shot) little web applications, hosted on my personal site, and they're built atop Viverra too.