samba4WINS is a replicating WINS server designed to run in parallel with Samba 3 servers, version 3.0.21 and higher. From SerNet's press release:

Initiated by SerNet and sponsored by Computacenter, Fujitsu Siemens Computers (FSC) and LiSoG e.V. it became possible to develop a free software needed by many users: the replicating WINS server - samba4WINS. Due to this solution WINS server running with Windows in a lot of environments can be migrated to Linux.

The urgent need to solve customer problems at the project partners Computacenter and FSC in October 2005 urged the plan to develop a new concept for WINS server within the Samba4-project. Until now Samba3 offers the possibility to start a WINS server but it cannot synchronize in a ring with other WINS servers, an ability that is requested in many complex networks. Even after complete migration to Linux/Unix/Samba Windows servers are still inevitable in those networks. This remarkable cost factor will be abolished with samba4WINS.

For more or for downloads, see the samba4WINS site (on Enterprise Samba).