Bolts is a collection of low-level libraries designed to make developing mobile apps easier.
SimpleAB is a framework to help you A/B test your Android applications with no hassle. A/B testing should be as simple as it needs to, and if you're not interested in handling huge SDKs and understanding complex dashboards and documentation articles, SimpleAB is the tool you was looking for.
Choose Files with this lightweight file chooser. Which provides many features for single selection multiple selection.