dotCMS
dotCMS is a JSR-168 compliant portal based open source content management system written in Java. It supports all the standard CMS features such as content staging, content versioning and content workflow.
dotCMS also supports inline content editing and WYSIWYG editor. It also offers third party integration with Liferay portal and OSCache.
dotCMS comes in 3 different distributions - open source, .edu edition and associate edition. Only the open source edition is free. Most of the advanced features are missing in the open source edition.