The WendzelNNTPd is a IPv6-ready NNTP usenet-server with the main goal to be as easy to use as possible. It is portable (Linux/*BSD/*nix), supports AUTHINFO authentication, contains ACL as well as role based ACL and supports invisible newsgroups. It currently supports MySQL and SQLite backends.
USRBAC is a kernel patch and userspace daemon that allows role based access control to be mitegated in userspace. The goal is to allow a secure way to impliment RBAC compliant security systems using a daemon in userspace