The Geomajas API project contains some annotations that can be used to indicate which parts (which classes and which (public) methods or fields) are considered as the API. This is particularly useful for projects where you want to mark the API without the need to refactor everything to interfaces and factories.
Geomajas caching plug-in is a plug-in for the Geomajas mapping framework that improves the speed by caching, by default based on the Infinispan cache library. The cached data can be tiles, features, bounds, or rasterized data (for the rasterizing plug-in). It has a configurable caching strategy, and automatically invalidates data when needed.
Geomajas geocoder plug-in is a Geomajas plug-in that provides a generic command and GWT widget for finding map locations based on a free string. You can configure how exactly this conversion is done, using either your own data or some external service like Geonames or Yahoo! PlaceFinder.
Very interesting framework. The extensible architecture, security features and strong API contract make this ideal for use in enterprise applications.