YaNC is short for "Yet another Newsletter Component". It allows you to define newsletters where visitors can subscribe to. You can then send mailings to the subscribers of those newsletters. YaNC provides you with some statistics on views, clicks etc. You can send out mailings using various own templates.
YaNC is available for download with a YaNC Club Membership.
NB: Community Builder integration is not present at this point, it's very much on the todo list though.