ABC Keyboard
This is a change to what you are used to in a keyboard: a keyboard layout that's entirely alphabetical.
From the App Store listing:
DyslexiaKey
Where the previous iOS keyboard app was iPad-only, DyslexiaKey works on the iPhone. From the store listing:
Wordsmith
[caption id="attachment_171" align="aligncenter" width="1043"] WordSmith shown with the Irving theme that uses OpenDyslexic[/caption]
Abilipad
Abilipad is a writing tool with custom keyboards, and more.
Get it: http://appytherapy.com