SCRIPTS, MONOLOGUES, EDUCATIONAL RESOURCES, ETC.
http://www.shakespeareswords.com/
Full texts of Shakespeare plays and poems, as well as a glossary of Shakespeare terms and phrases.
https://www.youtube.com/user/NationalTheatre
Watch segments of productions, interviews, and educational videos from London’s National Theatre.
PLAY/MUSICAL RESEARCH
Find full-length plays, one-act plays, and musicals. Many sites let you search by title, author, character count, theme, target audience, etc.
https://www.theatricalrights.com