The need is greater than ever to find cross platform apps. Devices in BYOD/BYOT schools vary from iOS to Android to Google.
Most of us have gotten accustomed to searching the iTunes App Store for apps for iPads and iPod touches.
The Educational Collections provide a jumping off place by content and specialty area for educators.
Amazon gives assistance to educators seeking Android apps for their Kindle Fire tablets. Amazon provides searches by content as well as price and including free.
Google apps are also easily searched by entering the content area into a normal Google search as in the attached photo, more will come up as an option, scroll down and choose Applications. This search provides cross-platform apps, Google as well as some iOS and Android.
The challenge for the educator is to find the best apps for the unit/standard and cross reference to provide equitable access to the necessary tool.