Android has the largest number of third-party applications available with over 2.8 million from which to choose. Many of these applications are designed to assist individuals with disabilities.
With a very open platform and philosophy, Android facilitates the development of applications that are not possible on other operating systems. For example, Android can support head-tracking solutions for people with mobility disabilities, as well as replace the native dialer and messaging applications with those that are much better for people with vision impairments.
RAZ Mobility has compiled and presents many of the best accessibility applications available on Google Play*. The applications are grouped disability type and include a brief description.
The selection is based on the value of application features for individuals with disabilities, the overall user experience and reliability.

A great option for exploring accessibility applications is the RAZ Mobility Accessibility Application Installer. The app offers a user-friendly selection tool based on type of disability allowing users to easily find and install helpful applications.
The RAZ Mobility Accessible Application Installer is pre-installed on all mobile devices offered by RAZ Mobility.
This section provides information about third-party applications. To see more info about Android built-in accessibility features, click the button below.
HEARING

CaptionMate
CaptionMate is a free service for individuals with hearing loss. It allows you to read both sides of the phone conversation instantaneously. CaptionMate works on smartphones, tablets, and all other phones, even your landline. Registration is free and creates no obligation.
Developer: Clarity Products LLC

InnoCaption+
InnoCaption+ (plus) is a free mobile app, funded by the FCC, for the oral deaf and hard of hearing that provides CART captioning for incoming and outgoing calls. If you voice for yourself, but have a hard time hearing the other party on the phone, this App is for you!
Developer: MEZMO Corporation

Live Transcribe
Live Transcribe is a new accessibility service built by Google for the deaf and hard of hearing. Using Google's state-of-the-art automatic speech recognition technology, Live Transcribe performs real-time transcription of speech to text on your screen, so you can participate in conversations going on in the world around you. You can also keep the conversation going by typing your response on the screen.
Developer: Research at Google

ooVoo Video Calls
ooVoo is a free instant messaging and video call app supported on Android, iOS, Windows and macOS. The app, with its cutting-edge technology, supports uninterrupted HD video calling with up to eight people simultaneously from anywhere around the world.
Developer: ooVoo LLC

Spread Signs
World’s largest sign language dictionary with over 200 000 signs! Learn American, Czech, British, Estonian, French, German, Austrian, Italian, Japanese, Latvian, Lithuanian, Polish, Portuguese, Brazilian, Romanian, Russian, Spanish, Swedish, and Turkish sign language.
Developer: Europeiskt Teckenspråkcenter
VISION

Eye-D Pro
Eye-D helps visually impaired be location-aware, explore and navigate to nearby places of interest, evaluate surroundings with their smartphone camera and read printed text. Similar to the free version of the Eye-D application but without advertisements and with some additional features.
Developer: GingerMind Technologies

The Google app keeps you in the know about the things you care about. Set up and use voice commands in Google Assistant. Find quick answers, explore your interests, and get a feed of stories and updates on topics that matter to you. The more you use the Google app, the better it gets.
Developer: Google

Lookout
Lookout uses computer vision to assist people who are blind or have low vision in gaining information about the world around them. Lookout uses the camera and sensors on your device to recognize objects and text, and gives you spoken feedback, earcons, and other signals to inform you about what it sees.
Available for Pixel 1, Pixel 2, and Pixel 3 devices running Android 8.0 and above."
Developer: Google LLC

NFB Connect
The improved and redesigned NFB Connect app is here! Get up to date on the latest Federation news. Read posts from our blog, the Voice of the Nation's Blind. Listen to the Nation's Blind podcast, the Presidential Release (in English or Spanish), the Braille Monitor, and Future Reflections.
Developer: National Federation of the Blind
SPEECH

CoughDrop AAC
Simple, modern AAC communication and support tool that empowers individuals and the teams around them. It is a full-featured communication app built for individuals with autism, cerebral palsy, Down syndrome, Angelman syndrome, Rett syndrome, or other complex communication needs.
Developer: CoughDrop, Inc.

ooVoo Video Calls
ooVoo is a free instant messaging and video call app supported on Android, iOS, Windows and macOS. The app, with its cutting-edge technology, supports uninterrupted HD video calling with up to eight people simultaneously from anywhere around the world.
Developer: ooVoo LLC

Predictable – AAC app
Exciting text-to-speech application offering customizable AAC functions with the latest social media integration, Predictable sets a new benchmark for the Android OS. The word prediction engine meets the needs of a wide range of AAC users, including those with MND / ALS, Cerebral Palsy and people with communication difficulties after a stroke or head injury.
Developer: Therapy Box Limited

Socky – Autism communication
First personal assistant to bring the words out for our unique children with Autism and ASD making it extremely easy for children to interact. Send one-tap messages using a huge vocabulary of symbols, Text to speech for the child - your message and every symbol is expressed vocally, send multiple-choice questions, send device-to-device messages like on Whatsapp or Messenger.
Developer: Ola Mundo

SymboTalk – AAC Talker
SymboTalk is a free app that talks for you by clicking on symbols (images or icons). The app has predefined communication boards from different areas of life, each board contains symbols (images). Clicking on a symbol reads it aloud and adds it to a sentence which can also be read. This way SymboTalk can be your voice and talk for you.
Developer: Elad Elram

TalkTablet – AAC
Award-winning TalkTablet is the only fully featured symbols-based AAC app that is available for iOS, Android, Windows and Kindle devices...with the ability to share buttons and pages between platforms. This version is for Android devices only.
Developer: Gus Communication Devices Inc
COGNITION

Action Blocks
Action Blocks makes routine actions easier with customizable buttons on your Android home screen.
Powered by the Google Assistant, you can easily set up Action Blocks for a loved one. Action Blocks can be configured to do anything the Assistant can do, in just one tap: call a friend, watch your favorite show, control the lights, and more.
Developer: Google LLC

CoughDrop AAC
Simple, modern AAC communication and support tool that empowers individuals and the teams around them. It is a full-featured communication app built for individuals with autism, cerebral palsy, Down syndrome, Angelman syndrome, Rett syndrome, or other complex communication needs.
Developer: CoughDrop, Inc.

Socky – Autism communication
First personal assistant to bring the words out for our unique children with Autism and ASD making it extremely easy for children to interact. Send one-tap messages using a huge vocabulary of symbols, Text to speech for the child - your message and every symbol is expressed vocally, send multiple-choice questions, send device-to-device messages like on Whatsapp or Messenger.
Developer: Ola Mundo
MOBILITY

Action Blocks
Action Blocks makes routine actions easier with customizable buttons on your Android home screen.
Powered by the Google Assistant, you can easily set up Action Blocks for a loved one. Action Blocks can be configured to do anything the Assistant can do, in just one tap: call a friend, watch your favorite show, control the lights, and more.
Developer: Google LLC

The Google app keeps you in the know about the things you care about. Set up and use voice commands in Google Assistant. Find quick answers, explore your interests, and get a feed of stories and updates on topics that matter to you. The more you use the Google app, the better it gets.
Developer: Google

Open Sesame – Touch Free Control
Never-before-seen Touch-Free control for your smartphone or tablet. Utilizing the front-facing camera with advanced computer vision algorithms, the entire phone can be controlled with head movements, with any app downloaded from the Play Store.
Developer: Sesame Enable

Voice Access
Voice Access is an accessibility service that lets you control your device with spoken commands. Voice Access can be useful for people who have difficulty using a touchscreen due to paralysis, tremor, temporary injury, or other reasons.
Developer: Google LLC
Source: https://www.razmobility.com/android-accessibility-applications/
NOTE: *RAZ Mobility or Special Needs Computers is not the developer of these applications and does not assume any liability or responsibility related to their use.