Sworkit has some yoga and pilates sequences. It's pretty good, great complement to Workout Trainer. Though their latest version doesn't work as well on my phone anymore, but it was just released so I'm sure they'll work out the kinks soon, and others don't seem to have issues with it.
All in one yoga is really good. Has a mac app too. I personally really like Piyo right now. It's a beachbody workout.
I dont think there are any good apps, at least not on Android.
I go to classes...but do Check out the blog
I use it to browse through challenge poses to do. But there is a lot of stuff on there that you might find useful.
Hope this helped.