MacTutor
History of Mathematics.

AWM
Association for Women in Mathematics.

Here are some links to famous people mentioned in Sofya Kovalevskaya's letters.

F.M.
Dostoevskii, author (access
to a site in Russia listing Dostoevskii's works)

Charles
Hermite
mathematician

Sofia
Kovalevskaia mathematician,
author, political

Gosta
Mittag-Leffler
mathematician

Jules
Henri Poincare
mathematician

Alexander
Pushkin author