cpm (Console Password Manager) is a small console tool to manage passwords and other sensitive data and store them in a public-key encrypted file. It also allows you to configure the whole hierarchy yourself, so it's easily adoptable for many requirements. The encryption is handled through GnuPG, and the data inside is stored as XML.
SUMO Access Manager is a security system for PHP Web applications that can be added using only one line of code. Administrators can manage authentication and authorization for users, groups, and security policies with easy, all through an intuitive Web based interface. You can create users that can authenticate their password via LDAP, MySQL internal users, MySQL/PostgreSQL/Oracle generic users tables, and via Google Mail account.
CF is a Linux/Unix command line utility for editing/managing AES-encrypted text files. Multiple users can edit the same files using their own separate passwords. It supports basic file locking, piping, adding, changing, removing, and listing keys. Editing sessions are as simple as typing "cf secretfile.cf"; CF asks for a password, decrypts the file, and starts an editor of choice. When the sessions ends, CF picks up the clear text and re-encrypts it. It takes care to let the clear files exist for as short periods of time as possible, and wipes them from memory and disk. It can be used for password management for single users or groups. It can also encrypt/decrypt streams when used in a pipe.
Secluded Notes is a simple text editor that keeps each document as a part of its own executable. That part is called an "attachment", and the program encrypts/decrypts it on the fly with an AES 128-bit cipher. As long as you close the application, it automatically updates itself for the next run.