How to test Ansible playbooks for *BSD/Linux/Windows using cloud CI?

Question

Travis CI

Good afternoon,
I write playbooks not only for Linux and I would like to do tests for other platforms.
Since the code is free and on github, there is no desire to do it through cloud provider instances and even at your own expense.
Tried to implement via Travis Ci, but ran into lack of *BSD/Windows.
Tell me how you can test playbooks?