Among Shakespeare's lesser-known plays, I would include Love's Labour's Lost, Coriolanus, and Richard II and the three parts of Henry VI. Timon of Athens, Titus Andronicus, and Henry VIII are lesser-known plays for which Shakespeare is thought to have co-authors.
Some lesser-known plays are Love's Labour's Lost, All's Well That Ends Well, Two Gentlemen of Verona, Winter's Tale, Titus Andronicus, Cymbeline, Timon of Athens, Coriolanus and the Merry Wives of Windsor.
"The Comedy of Errors," "All's Well that Ends Well," and "Troilus and Cressida" are three good but not so well known Shakespeare plays that you might want to consider.
Some lesser known plays by Shakespeare are "As you like it", "cymbeline", "two gentlemen of Verona", "king john", "Timon of Athens", "Coriolanus", and "Pericles, Prince of Tyre".
