Can we do integration of Salesforce data on Workamajig ? Please provide any link for research on this topic.
Yes you can create a web tab within Salesforce called "Workamajig" and link it to the Workamajig website. Then when a user is in Salesforce they can click the Workamajig tab and the website is displayed. This is a UI integration. For a business logic or data integration that would be different but you didn't specify the type of integration needed.