Maven had a long history and is well supported in the Java world. NMaven has received a less successful start and has never become as popular in the C#/.NET world as its larger cousin was in the Java world. The project seems close to dead(ish), but maybe I'm wrong.
Are there alternatives that, preferably using NAnt, are commonly used in favor of NMaven and have similar properties as Maven? What I'm looking for is a good open source automatic build server for .NET, if any exists. Or should I continue using NMaven?