Built-in Feature: Mac OS X

Slow Keys : Key sensitivity

Change the sensitivity of the keyboard to change the delay between when a key is pressed and when it is activated.

Detailson: Slow Keys : Key sensitivity
Built-in Feature: Mac OS X

VoiceOver : Screen reader / text to speech

Gesture-based screen reader. Touch screen to hear an item’s description, gesture with double tap, drag or flick. The user can modify the speaking rate, the speech’s voice, pronunciations and pitch, verbosity, braille, audio, rotor, rotor actions, typing style, phonetic feedback, typing feedback, modifier keys, enable “Always Speak Notifications”, navigate images, enable “Large Cursor”, or double-tap timeout.

Detailson: VoiceOver : Screen reader / text to speech