Install the Tuscany Eclipse Plugin 

The first thing you do is to start Eclipse and go to Help -> Software Updates -> Find and Install,
select "Search for new features to install" and then click next

On the next dialog, click on "New Remote Site..." to create a new site entry. Give it a name such as
"Tuscany" and add the site URL as http://archive.apache.org/dist/incubator/tuscany/java/sca/1.2-incubating/updatesite/

Make sure the "Remote Site" that was just created is selected, and click "Finish"

Select the "Apache Tuscany SCA Tools" and click "Next", and then, on the next dialog, click "Finish"

Accept the "Plugin License"

and next click on "Install All"

When asked to "restart eclipse", click the "yes" button.