ChromeOS Flex

https://chromeos.google/products/chromeos-flex/

ChromeOS Flex is a lightweight, cloud-based operating system designed to breathe new life into outdated or slow computers, making it a cost-effective solution for schools looking to extend their technology offerings. By installing ChromeOS Flex on older devices, schools can transform them into fast, secure, and easy-to-manage machines that run efficiently, helping to maximize the value of existing hardware. This reduces the need for costly hardware upgrades while still providing students and staff with access to modern web applications and tools. ChromeOS Flex also integrates seamlessly with Google Workspace for Education, making it easier for educators to manage classroom technology and for students to engage in online learning, collaboration, and research. The simplicity, speed, and security of ChromeOS Flex make it a great option for schools aiming to enhance digital learning while keeping budgets under control.  I've used it with a lot of our older 11" and 13" Macbook Airs!  Works great!  I even put it on a 27" iMac...that was pretty cool.