A free program for Android, by Hindi Infoware.
Deaf Sign Language is a free learning app to help you learn sign language from deaf or hearing people. It's designed to be easy to use, so you'll get a basic idea of what you're learning even if you don't know anything about sign language.
The app is organized into sections covering different aspects of sign language, such as letters and numbers. Each section includes a word of the day to help you learn new words.
The sections are as follows:
Alphabets - Letters that begin with the letter 'A' and go up to 'Z'.
Numbers - Numbers from one to ten.
Greetings and Phrases - A sign language greeting is a phrase that ends in a question mark. It can be used as a greeting or as a question.