The-Numbers.com, BehindTheName.com and FilmBug.com are some websites that list current movie stars alphabetically. Wikipedia also has a detailed list of actors and actresses indexed alphabetically.
The-Numbers.com has a people index page where it lists the most popular people in its database, which includes actors, actresses and directors.
BehindTheName.com has published a list that includes the most recognizable actors along with personalities for other performing arts as well. It includes television and stage artists also. Directors and producers are not included in this list, as they have a dedicated list under famous filmmakers.
FilmBug.com has published numerous lists of actors indexed based on various criteria, such as year of birth, date of birth, country of birth and state/region of birth.