To avoid doubt: I absolutely was referring to the Python program Ansible, which is why I used the word "tool" not "module".

Edit: this is a decent rundown of the various configuration-management systems, which features both Ansible and Rex: https://en.wikipedia.org/wiki/Comparison_of_open-source_configuration_management_software

Edit 2: 12 entries feature "Python" as a language, 6 feature "Perl" (a couple have both).