The site is the result of an European project co-ordinated by the University of Freiburg. It contains a diagnostic language test developed by experts from all over Europe, available on the internet free of charge.
http://www.dialang.org/

Extensive information about internationally recognized
English language examinations administered by examinations boards and awarding bodies in 100 countries.
http://www.britishcouncil.org/education/exams/index.htm

The Resources in Language Testing site, has an outstanding collection of links to articles about assessment and
evaluation. It also contains links to sites offering details about conferences and organizations dealing with testing.
Absolutely invaluable.
http://www.dundee.ac.uk/languagestudies/ltest/ltr.html

Colchester English Study Centre t English test. An interactive placement test with a grammatical ad a conversational set of questions. Immediate e-mail feedback.
http://www.edufind.com/english/practice/cesc/test.html