This category covers operating systems (OSs) which were created, and have as a main or major purpose, to educate and teach about OS concepts, design, programming, and/or larger, more general system issues; and/or support other types of education (networking, mathematics); OSs existing solely or in large part, to educate. Mostly the links in this category point to other OS categories and OSs there. The only OSs listed exclusively here are those for which no better or clearer category seems suitable.