In computing, Accessibility Toolkit (ATK) refers in particular to the GNOME ATK.
The GNOME ATK, a developer toolkit, allows programmers to use common GNOME accessibility features in their applications. This includes such features as high-contrast visual themes for the visually impaired and keyboard behaviour modifiers (e.g. sticky keys) for those with diminished motor control.
GAIL (the GNOME Accessibility Implementation Library) implements the accessibility interfaces defined by the GNOME Accessibility Toolkit (ATK).