What are some popular plays that deal with gay or lesbian characters?

Angels in America is a phenomenal play, and probably 75% of the characters are either gay or hinted to be gay. There are characters in The Glass Menagerie and Three Tall Women who are not explicitly stated to be gay, but are based on their creators (Tennessee Williams and Edward Albee, respectively), who are. M. Butterfly is not technically about gay people, but it does feature a relationship between two men.

Last Summer at Bluefish Cove is an Excellent play about a gang of lesbians who rent cottages over the summer together.