Google Translate - Google's free service instantly translates words, phrases, and web pages between English and over 100 other languages.
Signily - Communicate with sign language on iOS
Mate Translate - Ultimate translation app for Mac, iOS, Chrome and many more
Transcense - Converse w/ the deaf, w/o sign language (pre-launch)
Dictation - The fastest and most accurate speech recognition software
Uber Sign Language - Start a conversation in American Sign Language.