Most mussar sefarim are very oriented towards men, with lessons on things such as how to treat your wife, the dangers of pursuing women, or the importance of learning. Also, many sefarim I've seen written for women are very generic and watered down hashkafa sefarim, lacking originality or deep insight. What is a good, intelligent, well-written mussar sefer with female perspective?
For English readers there is one from Rabbi Shimshon Pincus who wrote a Mussar Sefer for woman called Nefesh Chaya.
For Hebrew readers there is a Sefer Chukei HaNoshim written by the Ben Ish Chai which is a Mussar Sefer geared specifically to women.
For Yiddish readers there is a Sefer Mainekes Rivka which was written by Rivka Tiktiner in in the late 16th century. This is available by contacting firstname.lastname@example.org
Chovos Halevavos. There's a new digital translation in the making, available online at http://dafyomireview.com/article.php?docid=384
Outside of the Ashkenazi world, Chakham Yosef Chayyim (the Ben Ish Chai) wrote a beautiful personal growth manual for women, and one that is often studied by men as well. He wrote it in Judeo-Arabic, and called it Qânûn-un-Nisâ'. It has since been translated into Hebrew, as חוקי הנשים, and into English, as Laws For Women. The English translation has been done by Rabbi Moshe Schapiro.