It's been fun to help with concept development and provide research and text for several current Apps. Two of these - Scotland's Nature and Scotland's Big Five - focus on Scottish wildlife and landscapes.
Hidden Histories - Edinburgh's Royal Mile - is completely different. It allows App users to discover many surprising stories (some seldom told) about people associated with buildings along one of Europe's most famous streets. No entry fees need to be paid - you can appreciate these hidden histories from the pavement.