Uyuni is described as 'solution for organizations that require absolute control over maintenance and package deployment on their servers. It lets you manage large sets of Linux systems and keep them upto date, with automated software management, asset management, and system provisioning'. There are six alternatives to Uyuni for a variety of platforms, including Linux, Self-Hosted solutions, Windows, Mac and BSD. The best alternative is Ansible, which is both free and Open Source. Other great apps like Uyuni are Salt (Free, Open Source), SUSE Manager (Paid), EuroMan (Paid) and Fleet Commander (Free, Open Source).
EuroMan is a tool to manage operating systems of the Enterprise Linux family (EuroLinux, Red Hat Enterprise Linux, Oracle Linux, and CentOS). It enables the administration of the entire physical, virtual, and cloud environment using a GUI console.
Fleet Commander is an application that allows you to manage the desktop configuration of a large network of users and workstations/laptops. It is primarily targeted to Linux systems based on the GNOME desktop.