Allow input by Gesture
For some users who are blind or deaf or hard of hearing, it is much easier and more natural to use gesture-based text input methods. This feature may allow text input using sign language, using handwriting, or swiping through letters (or swipe to form the pattern) on a virtual keyboard (onscreen or even in the air), and others.
Discussion by Disabilities (Benefits & Preferred Behaviors)
Using gesture-based input that is unrestricted to accurate pointing can greatly simplify input for people are blind or have low vision.
Deaf and Hard of Hearing
Sign language recognition will allow users who are deaf or hard of hearing input text more easily and naturally.
Please note that these products are not necessarily endorsed by RtF, but represent the range of available options.
Free, not necessarily open source
These products are free to use, but may have strict restrictions on viewing and modifying source code.