Free Database to Verify the Accreditation of any College or University in the World?
For information about European institutions, the best starting point for such an online search is possibly the ENIC-NARIC network (European Network of National Information Centres on academic recognition and mobility) which lists the national accreditation organisations.

A list of accredited Swiss higher education institutions can be found at the site of the Rectors' Conference of the Swiss Universities CRUS.

A database of accredited study programmes in Germany can be found at the site of the German Accreditation Council.

The Accreditation Organisation of the Netherlands and Flanders NVAO has a similar database of Dutch and Flemish study programmes and institutions.