Accerciser is an interactive Python accessibility explorer for the
GNOME desktop. It uses AT-SPI2 to inspect and control widgets,
allowing you to check if an application is providing correct
information to assistive technologies and automated test frameworks.
Accerciser has a simple plugin framework which you can use to create
custom views of accessibility information.

In essence, Accerciser is a next generation at-poke tool.

Homepage:
https://live.gnome.org/Accerciser/
