An append only database manager in the style of dbm. It has both a C and a Python interface and is ACID compliant. Internally it uses an immutable B+ Tree. (Being append only doesn't mean that you can't replace records or delete keys).
Rolodap is a LDAP based contacts directory/manager. It uses a shared directory, but presents itself to users as a series of individually defined address books.Simplicity of end use is a primary goal. Rolodap integrates with emailers that support LDAP.