Wikipedia
Seasar
Seasar2 is an open source application framework similar to the Spring Framework (Java). Initially, it was developed for the Java platform by Yasuo Higa, but .NET and PHP platforms are currently supported as well. Seasar2 has a large base of Japanese users, but there is a steady increase of non-Japanese users since English support was announced at the JavaOne 2005 Tokyo conference.
Seasar2 is currently supported by the Seasar Foundation, a non-profit open source organization.