The Box View Java SDK by Box allows to interact with the API capabilities of file conversion from PDF and Office to HTML. It requires Java 1.6 or newer. It contains guides to install JAR, obtain an Api Key, and review examples to use java-box-view in the developer's code.
Dropbox recently released v2 of its Team Events API. The Team Events API is part of Dropbox Business and allows users to track activity within Dropbox. The API has been completely rewritten from v1, and includes over 300 events that users can access through the activity log.
Developers with a penchant for green-energy powered APIs should probably take a look at GreenQloud's IaaS offerings that are API-compatible with Amazon's EC2 and S3 services. The Icelandic company's datacenters survive on nothing but 100 percent renewable energy.