@Suiseiseki I call them Libre to be clear - here's more detail: https://tech.oeru.org/foss-libresoftware-its-about-clarity-and-values They're also free (in both senses). But when I talk to school staff who've got no idea of what I mean by 'libre' or 'free', I use a term they'll recognise. When I establish rapport with them, I'll explain in more depth.