Draw from a paper bag (Sorteio no Saco)
https://play.google.com/store/apps/details?id=com.gmail.nihilculpa
This app recently reached 100k downloads in GooglePlay.
It was developed with the main purpose of learning B4A.
The application helps in making draws, raffles and lotteries.
Put numbers or names in the paper bag, shake the bag and see the winner in a paper strip drawn from the bag.
There is also a numbers generator for lotteries (the most important brazilian lotteries and others, customized by user).
Results and lottery numbers can be shared in different ways.
The app is multilanguage (english, spanish, portuguese), with the help of AndroidResources library.
It has an html based help system: pages are showed in a WebView object.
Other libs used (many thanks to the developers):
AHViewPager, AndroidResources, Clipboard, ContentResolver, Dialogs, IME, JavaObject, StringUtils, RandomAccessFile, Reflection and StringUtils.