SparkNotes and CliffsNotes are two major study guide services that provide free analyses of well-known literature, including poetry. The websites of both publications offer searchable study guides about poets, their works and their major ideas.
SparkNotes provides in-depth analyses of specific poems. Each entry contains the full text of the poem and a summary of its content. It also provides an analysis of the poem's form, including rhyme scheme and meter. Finally, there is a detailed commentary section that explores the themes of the poem and its place in the author's canon.
CliffsNotes provides a more general look at an author's overall body of work and ideas in addition to short analyses of the author's major works.