The WSO2 Mashup Server is an open source mashup platform that hosts JavaScript based mashups. It is based on Apache Axis2 and other open source projects, and provides JavaScript authors the ability to consume, compose and emit web services, feeds, scraped web pages, email, and instant messages. The source code is freely available under the open source Apache License. It provides a runtime platform for developing and deploying mashups. It can be downloaded and deployed locally or within an organization.