Sakai is an online Collaboration and Learning Environment. Many users of Sakai deploy it to support teaching and learning, ad hoc group collaboration, support for portfolios and research collaboration.

Sakai is a free and open source product that is built and maintained by the Sakai community. Sakai's development model is called "Community Source" because many of the developers creating Sakai are drawn from the "community" of organizations that have adopted and are using Sakai.

The Sakai community is actively developing new Sakai tools: IMS Common Cartridge, SCORM, blog tool, shared whiteboard, shared display, multipoint audio, multipoint audio, pod-casting, IMS Tool Interoperability, and others.