There is this online apk downloader that allows anyone to generate apk file of any free android app listed on the google play store.
You can access the APK downloader at: http://apps.evozi.com/apk-downloader/
You will find this very useful if you need an Android app which Google play store is claiming to be incompatible with your phone. Also useful to those that want to install Android apps on their Blackberry 10 phones.
Using the app is easy. Just enter the package name or Google Play URL for the app you want and after that, it will generate a download link for the apk file of the app. Download and enjoy!