Academy of American Poets–thousands of poems in English up to the present day with a focus on contemporary poets, essays on poetry, resources for teachers, links to poetry events, and more 
Duotrope–for a subscription fee, you get access to calls for submission, literary magazines, interviews, literary news, a submission tracker, and more
New Pages–lists of literary magazines, calls for submission, contests, graduate programs, independent bookstores, and more
Poetry Daily–a new poem featured every day
Poets & Writers–articles on the writing life, interviews with writers and agents, calls for submission, grants and awards deadlines, classifieds, list of small presses, and more
Submittable–if you want to begin submitting your work to literary magazines, you need an account here. It’s free, and used by most literary magazines and many small presses.
Trish Hopkinson’s website–lists of literary magazines and interviews with editors, poetry and writing resources, a newsletter/blog you can sign up for
Word Associations Network–a place to look up words associated with other words by connotation, psychological perception, and more.