British Library
British Library: Discovering Literature: Politics and Religion
The Civil Wars and the Restoration of the monarchy, the Enlightenment or 'Age of Reason', and British colonialism: investigate the political and religious contexts of Restoration and 18th-century literature.
Contemplator
Contemplator's Short History: John Gay and the Beggar's Opera
A biography of John Gay. This site also contains many related links including one of the the entire text of his play, "The Beggar's Opera."
Other
The Medal by John Dryden
The full text of the poem, along with a brief opening note is offered at this site.