Any university with an open admissions policy.

If you are not a matriculated student (i.e. not accepted as a regular SDSU student) you may take courses, on a space available basis, during fall and spring semesters through the College of Extended Studies Open University. These units do not count as residence units.

a British university that is open to people without formal academic qualifications and where teaching is by correspondence or broadcasting or summer school

In Britain, the Open University is a college especially established to educate older people who did not get a degree when they were young. Students study by special television and radio programmes and they usually send their work to their teachers by post.

The Dutch Open Universiteit is a university for distance learning at university level. This means that students do not take part in colleges but study at home.