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 * [Ansible Docs](http://docs.ansible.com/ansible/latest/playbooks_intro.html#handlers-running-operations-on-change) - Handlers: Running Operations On Change + notify & listen
 * [volanja/ansible_spec](https://github.com/volanja/ansible_spec) - a ruby gem that connect Ansible & Serverspec for Test Driven Server Configuration (or TDD).
 * [Bjoern Meier](http://reinout.vanrees.org/weblog/2017/10/26/6-ansible.html) - PyCon.de: use ansible properly or stick to your scripts. **Bonus** : [Slides in PDF](https://github.com/blue-yonder/documents/blob/master/presentations/PyCon.DE%202017/No_Compromise-Use_Ansible_properly%20_or_stick_to_your_scripts.pdf)
+* [Ansible-Semaphore](https://github.com/ansible-semaphore/semaphore) - open source Ansible UI
+* [Jeff Geerling](https://www.jeffgeerling.com/blog/2017/get-started-using-ansible-awx-open-source-tower-version-one-minute) - Get started using Ansible AWX (Open Source Tower version) in one minute
 
 ### Ansible Vault
 * [brianshumate/ansible-vault](https://github.com/brianshumate/ansible-vault) - Ansible role for Vault