Vitalnix is a suite consisting of a library providing unified methods to access different user databases (Shadow, LDAP, etc), tools for user/group management, and a program for managing users in batch, suitable for large systems.
Grained Login is a fine-grained login system for Qt applications. It uses SHA1 hashed passwords to retrieve user rights from a SQLite database. An administration dialog handles the maintenance of the users, the roles, the rights and the password history.