BuzzCards
This app helps a deaf person communicate with someone that does not know sign language.
https://play.google.com/store/apps/details?id=com.sorenson.buzzcards
Hand Talk Translator Brazilian Sign Language (Libras)
The app translates written words or spoken language into Brazilian Sign Language (Libras).
https://play.google.com/store/apps/details?id=br.com.handtalk&hl=en
Hearing Test
This app gives a basic hearing test. It can be used to illustrate a point. If you truly want to measure hearing I would recommend going to a professional for testing.
https://play.google.com/store/apps/details?id=mobile.eaudiologia
BuzzStickers
These are sign language stickers. They are better described as sign language emojis. With this, app texting just got better for the deaf.
https://play.google.com/store/apps/details?id=mvrs.sorenson.com.buzzstickers
ntouch
This app allows you to communicate with a sign language interpreter.
https://play.google.com/store/apps/details?id=com.sorenson.mvrs.android
ASL Dictionary
This app is a dictionary for sign language.
https://play.google.com/store/apps/details?id=com.signtel
DeafNote Free
This is a note-taking application.
https://play.google.com/store/apps/details?id=tashuapps.deafnote