The Mapbox Navigation iOS SDK provides turn-by-turn navigation inside your mobile app. Some features include; Drop-in navigation UI, Automatic rerouting, Walking, biking, and driving, Navigation map with traffic and more. Mapbox is an open source mapping platform for developers.
Wheelmap.org has created a user driven resource for identifiying wheel chair accessible locations. The open source platform allows anyone to add accessibility descriptions and update old ones. The company provides the Wheelmap API for integration of this growing resource.