New version of RAutomation just got released!
RAutomation is a small and easy to use library for helping out to
automate windows and their controls
for automated testing.
=== All adapters
- added Window.windows, #windows, #buttons and #text_fields methods to
retrieve collection of elements and use them with Enumerable/Array
=== WinFFI adapter
- added Window#child method for searching child windows and popups
- added initial support for Radio, Checkbox, SelectList and Table
=== AutoIt adapter
- allow to search windows by PID
You can install it with:
gem install rautomation
Read more information from the README  or check out the source code