This document summarizes Saiku, an open source business intelligence and analytics tool. Saiku provides a lightweight user interface using HTML and JavaScript with a separate Java server and RESTful JSON communication. It is 100% open source and easily integrates with other data sources like SAP BW, Microsoft Analysis Services, and Mondrian. The roadmap outlines upcoming releases in early 2011 that will add features like drill support, visualizations, and basic integration with SAP BW.