How do I do 6-key Braille input?
Just recently out I think, Braille Writer for OS X:

http://ethervision.net/blog/braille-writer-mac-apple

If you have an iOS device, you there is Braille Pad. 

https://itunes.apple.com/us/app/braille-pad-pro/id544696675?mt=8

https://itunes.apple.com/us/app/braille-pad-student/id551373276?mt=8