Nlyte Software is described as 'A Gartner Magic Quadrant Leader in 2014, 2015, 2016, Nlyte is the leading provider of Data Center Infrastructure Management and has the largest and most sophisticated DCIM implementations in the world with a modern, web-services architecture' and is an app. There are more than 10 alternatives to Nlyte Software for a variety of platforms, including Linux, Windows, Web-based, Mac and BSD apps. The best Nlyte Software alternative is Ansible, which is both free and Open Source. Other great apps like Nlyte Software are DCImanager, Puppet, CTO.ai and RackTables.
Nlyte is a DCIM tool, mostly focused on inventory, power, physical cabling, and asset management. Ansible provides configuration management systems themselves. They share the phrase 'configuration management' in their description, but they manage very different configurations of things.