1. 2015. BlindSquare Indoor Navigation. (2015). http://blindsquare.com/indoor/ 2015. BlindSquare Indoor Navigation. (2015). http://blindsquare.com/indoor/
2. 2019. GetThere GPS nav for blind. (2019). https://play.google.com/store/apps/details?id=com.LewLasher.getthere 2019. GetThere GPS nav for blind. (2019). https://play.google.com/store/apps/details?id=com.LewLasher.getthere
3. 2019. Microsoft Soundscape. https://www.microsoft.com/en-us/research/product/soundscape/. (2019). 2019. Microsoft Soundscape. https://www.microsoft.com/en-us/research/product/soundscape/. (2019).
4. 2019. Wayfindr Open Standard. (2019). https://www.wayfindr.net/ 2019. Wayfindr Open Standard. (2019). https://www.wayfindr.net/
5. NavCog