Detour - Immersive audio walks, now in 17 cities
Zirtual - Virtual assistants for busy people.
Urban Walks - A nicer way to explore New-York
TimeEtc - Time Etc offers virtual assistants for entrepreneurs and professionals.
yapQ - Turn your smartphone into an audio tour guide
Prialto - Prialto employs expert virtual assistants that can efficiently assist you with challenging tasks.