Unimus is described as 'Network automation, disaster recovery, change management and configuration auditing. Unimus is NCM software, extremely easy to deploy and use, providing a wide feature-set that will help you run your network' and is a network configuration manager in the network & admin category. There are more than 10 alternatives to Unimus for a variety of platforms, including Linux, Windows, Mac, Web-based and iPhone apps. The best Unimus alternative is Ansible, which is both free and Open Source. Other great apps like Unimus are DeviceExpert, RANCID, Oxidized and GenieACS.
Ansible is an IaC automation platform, where Unimus focuses on config backup, change management, config auditing. There are automation features in Unimus, but its is not an IaC platform. The automation in Unimus works very differently to Ansible.