If you're heading to the Open'er Festival in Poland, then Opener is the perfect app for you. Developed by MoveApp, Opener is a free Android app that falls under the Travel & Navigation category and focuses on Maps & GPS.

Opener is designed to help you make the most of your festival experience. The app provides a comprehensive map of the festival grounds, including the location of stages, food stalls, and restrooms, so you can easily find your way around. It also offers real-time information about the festival schedule, so you can plan your day and never miss a performance.

In addition, Opener provides useful information about the festival itself, including the latest news, weather updates, and transportation options. With Opener, you'll have everything you need to navigate the festival and enjoy all it has to offer.