WSO2 is one of the open source mashup solutions. It offers data mashup service and a platform
for creating, deploying, and consuming Web services Mashups. It provides some features like "Support for consuming and deploying services", "Automatic and UI-based generation of Web
services artifacts", "Getting results various user interfaces as web pages, portals, e-mail, Instant
Messenger service, SMS".
Read more at: http://wso2.org/projects/mashup