OracleBones is a Android app for Chinese learners to have fun exploring the writing of Chinese language. There are four categories in the app, numbers, nature, animals, and life to study ancient Chinese oracle bone scripts.
This free app is available at Google Play Store.
https://play.google.com/store/apps/details?id=com.yuanjiexie.spring2016.oraclebones
Product page:
http://www.yuanjiexie.com/oraclebones.html
中文页面 （Chinese）：