1. Google Inc., TalkBack (2014),
https://play.google.com/store/apps/details?id=com.google.android.marvin.talkback
2. Apple Inc., VoiceOver for iOS (2014),
http://www.apple.com/de/accessibility/ios/voiceover/
3. OEBB, Scotty (2014),
http://www.oebb.at/de/Reiseplanung/Fahrplanauskunft/Mobile_Dienste/SCOTTY_mobil/index.jsp
4. Fahrplanauskunft und Routenplaner - nextstop.at, MobileCity (2014),
http://www.nextstop.at
5. Zervaas Enterprises, TransitTimes+ Trip Planner (2014),
http://transittimesapp.com/