Classtree

It's hard to say if Classtree would really save teachers two hours a day, as its developers claim. Its permission-slip feature is probably its biggest selling point: It's super easy to upload a premade document, choose the space for parents to sign, and send the permission slip to a group of parents whose contact information you've already loaded onto the site. It would clearly take some setup time to customize the app effectively, but its straightforward interface might be a great fit for gathering permission slips, especially if you have a tech-savvy parent population.

Unfortunately, you can't build permission slips or other documents directly in the app. Some other tools allow you to edit text and add pictures; this is a purely import-and-send tool. Classtree would be even better with a clearer sense of what it can really do; without much built-in help text or information about the features, teachers are mostly on their own to figure out the smartest ways to use the app. Unfortunately, the app is infrequently updated on Google Play and the iTunes Store, and there doesn't seem to be a large teacher community using it. Plus, some of the features described on the developer's website (such as, inexplicably, "temperature capture") sound a little intrusive. With those things in mind, this tool might not be worth the time investment to figure out its best use in the classroom. It's definitely intriguing, but its features might be too limited to warrant using it extensively.