This is an excellent website from the University of Toronto based on the classic Canadian teaching anthology first published by Professor W. J. Alexander. The website contains 3391 carefully chosen poems and are supported by criticism. The poems can be searched by title, author, first line and last line.
Along with these tools, the site also has a very extensive bibliography and glossary of poetic terms. In short, a very thorough tool for a sophisticated study of British and Canadian poetry.