Presto Mashup Studio
You could say that the heart of Presto is the Mashup Server, and its brains are made of EMML, but its arms and legs are Presto Composers. In other words, Composers are what make Presto Mashups go.
Presto features two composition environments - Wires for business and IT users to rapidly wire together and deploy mashups, and Studio for Java programmers to completely access the capabilities of Presto. Plus, Presto enables both user types to create and use Mashlets, reusable enterprise widgets that give mashups a UI face.
Presto Mashlets - Enterprise Widgets as Mashup Interfaces

Presto Mashlets bring dynamic mashups to the enterprise through widgets - a graphical user interface (GUI) that displays in an information arrangement changeable by the user. Once the mashlet is created it can be used anywhere: in an enterprise portal, in a blog, or even as a sharable micro-application that can be placed on any user's desktop. Learn more about Presto Mashlets here.
Presto Wires Visual Composer - Rapid Mashup Creation

Presto Wires, a Web browser-based visual mashup composition tool for IT and business users, was designed with rapid mashup development in mind. Wires users consume and combine data from disparate data sources to make decisions in a fraction of the time and achieve a more complete picture of a financial, operational, or market situation. Learn more about Presto Wires here.
Presto Mashup Studio - Full-powered Eclipse Plug In

Presto Mashup Studio is an Eclipse plug-in which provides Java programmers complete control to design, test, debug and deploy mashups. Developers use Presto Studio to write mashups in EMML via a Mashup Perspective, and leverage familiar debugging features in a Debugging Perspective. In essence, Studio brings the power of Presto into the environment where developers spend their time, marrying the efficiency of Presto’s mashup tools and language with the full power of Eclipse development environment. Learn more about Presto Studio here.
