User engagement is important to attract users, keep them interested, and keep them coming back. There are plenty of tools for developers to add engagement functions to applications. Developers looking for Engagement APIs can start with this list of ten popular ones from ProgrammableWeb.
AdStage built a platform that aggregates data gathered from advertising tools. As AdStage built infrastructure to accomplish this, the company decided to move beyond ad services and into more business tools. Now, other BI system data is included and is accessible via the new Universal Data API.