Infinitive OS is described as 'open-source project created to replace windows and macOS, it mounts the latest versions of the Linux kernel and contains open source components but also proprietary software'. There are four alternatives to Infinitive OS for a variety of platforms, including Linux, Mac, Nix Package Manager, Windows and Windows S. The best alternative is Ubuntu, which is both free and Open Source. Other great apps like Infinitive OS are macOS (Free), MerOS (Free, Open Source) and Airyx (Free, Open Source).
Ubuntu is a community developed, Linux-based operating system that is perfect for laptops, desktops and servers. It contains all the applications you need - a web browser, presentation, document and spreadsheet software, instant messaging and much more.
MerOS is a user friendly, good looking, general purpose Nix based GNU/Linux distro. It is ideal for those who want the most out of their computers, a well-designed desktop environment and an uncommon Linux experience.
Airyx is a new open-source desktop operating system that aims to provide a similar experience and compatibility with macOS on x86-64 systems. It builds on the solid foundations of FreeBSD, existing open source packages in the same space, and new code to fill the gaps.