Holger, co-founder of Meerli here. A lot of them definitely are concepts. That always happen when you ask designers to show of their hot stuff, but we do also

Holger, co-founder of Meerli here. A lot of them definitely are concepts. That always happen when you ask designers to show of their hot stuff, but we do also have some very cool designers, who're showing off some very cool apps, that has been released. For example http://meer.li/designs/clear http://meer.li/designs/clear or http://meer.li/designs/wthr-app http://meer.li/designs/wthr-app. Prismatic also uploaded their upcoming app http://meer.li/designs/prismatic http://meer.li/designs/prismatic, which is really hot as well. I've gotten to play around with it a bit and it's smoking hot UX-wise :-).