In the spirit of Selenium's universal platform support, I added AT-SPI support for testing on the GNOME desktop.
AT-SPI has almost the same MSAA-like subset that Windows APIs have, so this was an easy task.
Our cross platform schema includes:
1. Accessible object hierarchy
2. Accessible object properties like name, role, description, value, state and actions.
3. Events such as: state-changed, focus-changed, value-changed.