The Make Use Of website has a section on technology and accessibility. It covers Apps that help people who are blind and people who are deaf or hard of hearing. The videos simply explain how they work and what value they add to the lives of people who are blind, deaf, or hard of hearing. They include RogerVoice, and Tap, Tap See.
Of course, you don’t have to be blind or deaf to benefit from some of these Apps. As in many cases, products designed for people with disability often create greater convenience for others.