http://www.better-english.com/ bussiness english. multiple choice. many fFITBAs

http://www.englisch-hilfen.de/en/ huge web with loads of activities and some theory.

http://www.ego4u.com/ English Grammar Online. 'nuff said.

http://www.english-4u.de/ Another one.

http://ww2.college-em.qc.ca/prof/epritchard/stativef.htm says "pre-intermediate to high-intermediate but some activities are appropriate for ESO.

http://english.specialist.hu/a3/inc.htm

http://learnenglish.britishcouncil.org/en/ what else?

http://englishgrammarpass.com/exercises/grammar_vocabulary/GxL1XV3Ack.html more tests.