Its not at all unusual for third parties to develop apps for publishers and manage their sales channels. If you survey the education space, many publishers do this. Its just another way of handling the mobile space.

Our apps have been taken down, so there is no way to link to them unfortunately.

We have occasionally gotten frivolous claims for TM infringement, which we attempt to clean up quickly (If you have a lot of apps, you'll know that you get targeted by random individuals with no case). We were in the middle of an especially tenacious individual who was fraudulently claiming we were using a name he did not have a TM on. As our lawyers were trying to solve the problem, we were shut down.