Freespire

If you're using one of these computers with OS X Mavericks or later, you can install macOS Catalina. Your Mac also needs at least 4GB of memory and 12.5GB of available storage space, or up to 18.5GB of storage space when upgrading from OS X Yosemite or earlier. To get the latest features and maintain the security, stability, compatibility, and performance of your Mac, it's important to keep your software up to date. Apple recommends that you always use the latest macOS that is compatible with your Mac. The version of macOS that came with your Mac is the earliest version it can use. For example, if your Mac came with macOS Big Sur, it will not accept installation of macOS Catalina or earlier. If a macOS can't be used on your Mac, the App Store or installer will let you know. For example, it might say that it's not compatible with this device or is too old to be opened on this version of macOS.

Ubuntu is a free, open-source Linux operating system developed by Canonical and the Ubuntu community for desktop computers, servers, cloud infrastructure, and connected devices. Based on Debian, the distribution provides a user-friendly computing environment with regular software updates, security patches, and extensive hardware compatibility. Ubuntu Desktop features the GNOME desktop environment and includes applications for web browsing, office productivity, multimedia, software development, and everyday computing. Its APT package manager and Snap ecosystem allow users to install, update, and manage thousands of software applications. Ubuntu offers Long-Term Support (LTS) releases with five years of standard security maintenance and optional extended coverage through Ubuntu Pro. The operating system also supports virtualization, containers, Kubernetes, artificial intelligence development, and enterprise infrastructure management across on-premises and cloud environments.