BBC BITESIZE is an excellent resource IGCE.
John D. Clare is really helpful for several of the units we study at IGCSE – especially International Relations Between the Wars; Germany 1919-39 and the Cold War.
Mr Allsop History is useful for teachers and for students. There are loads of good revision podcasts tailored specifically for the IGCSE on this site.
History Mad is an excellent resource for teachers and students. Look for the links on international relations, the Cold War, Germany and the USA.
Macro History. This site is very useful for IGCSE and beyond.