Geonode software, backed by the World Bank OpenDRI, BoundlessGeo/ OpenGeo and others - an initiative that may have started at the CAPRA project in Central America. In the Caribbean, open data nodes can be found in Trinidad & Tobago, Haiti, Dominica, Saint Lucia, Guyana, Antigua and Jamaica. (also holds few data for other islands) and a World Bank project - CHaRIM (holds data for Belize, Dominica, Grenada, Saint Lucia and St. Vincent and the Grenadines). There's also a small experiment (mine) in open public health data using Google Fusion Tables for mapping. Would like to hear of the other open data outposts out there - spatial or not.