The Xillio API is a product I worked on for the greater part of my time at Xillio. It is a content unification platform which provides an API that gives you easy access to a bunch of different content repositories. It does this in a unified way by providing a generic entity model which can represent a file, web page, comment, etc. This meant that once you write an integration with the API, you can access dozens of systems without needing any specific knowledge about those systems. This tremendously speeds up development for all kinds of applications, like migration, archival, content analysis, and many more integrations.