man-db is an implementation of the standard Unix documentation
system accessed using the man command. It uses a Berkeley DB
database in place of the traditional flat-text whatis databases.
man-db is used by several popular GNU/Linux distributions,
including Debian and
SuSE. It also compiles and runs on a
number of proprietary Unix systems.
The Savannah project for man-db will, I hope, be regularly updated with new releases. The CVS repository is also kept there.