There are many sites, individuals, institutions which provide Classics resources. The following is a selection. If you would like a link to your own website to be included here, contact Steve Jenkin.
Hellenic Bookservice (Monica Williams)
http://www.hellenicbookservice.com/
Bloomsbury Publishing
Textbooks and Prescribed Texts
ZigZag Education Guides
ZigZag Classics
Terry Bird Running Vocabularies
http://www.tabclassics.uk/
Classical Workbooks (David Carter)
http://www.classicalbooks.co.uk/