I'd like to introduce DotaScoop, a free open-source community app for Android. Together with a few other people, I've implemented some features that I always wanted to have quick access to on my phone.
Basically, the app provides handy game data on Dota 2. It gives you an up-to-date dictionary of all heroes and items, an overview of top tournament and ranked matches currently being played and recently finished, and the official leaderboards of all four regions.
You can find screenshots in the Google Play Store entry.
Google Play Store link: https://play.google.com/store/apps/details?id=github.com.rhacco.dotascoop
GitHub link: https://github.com/Rhacco/DotaScoop
If you're interested in how I implemented the features or in working with me, please don't hesitate to ask. This project was a huge learning experience for myself and I'm happy to help and share knowledge.