The materials listed in this pathfinder are all excellent resources covering women in music. The pathfinder for sources is divided into general resources and specific genre categories. Each genre section is further divided into texts, sound recordings, scores, videos and archival collections.
This site from the University of Iowa's women's studies program has compiled various links covering women in music.
An open access online resource covering women's history in music. The site includes bibliographies, biographical sources, historical overviews, and primary sources.
The International Alliance for Women in Music (IAWM) is a global network of women and men working to increase and enhance musical activities and opportunities and to promote all aspects of the music of women.
This website from the University of Oregon is a discography, or more specifically a scoreography, that includes an overview of their collections of scores from female composers.