yapQ - Turn your smartphone into an audio tour guide
Detour - Immersive audio walks, now in 17 cities
Tramble - The codebreaking walking challenge. UK only
Instalist - The most Instagrammable photo spots around the world 📸🌎
Urban Walks - A nicer way to explore New-York
Procatinator - Random full screen cat gifs to music. Need I say more?