Used libraries

ActionBarSherlock (Link)

by Jake Wharton, licensed under the Apache 2.0 license

Android-ViewPagerIndicator (Link)

by Jake Wharton, licensed under the Apache 2.0 license

Apache Commons (Link)

by The Apache Software Foundation, licensed under the Apache 2.0 license

flattr4j (Link)

licensed under the Apache 2.0 license