The Gliffy Java SDK by Gliffy allows API interaction to access drawings data, particularly useful to integrate diagrams and flowcharts into applications. Resources available include client, document, OAuth token credentials, and test account.
Chart APIs are useful and popular, and Google knows how to do them well, so they're continuously adding more features and options for customization to their Visualization API. The Google Code Blog recently highlighted a few of the newest features.
Google has announced the release a new production version of the Google Visualization API which includes several brand new features including timeline charts, donut charts, map data refresh for geoChart, customizable tick values and labels, and other chart improvements.
Nineteen APIs have been added to the ProgrammableWeb directory in categories such as Payments, Healthcare, and Charts. Highlights today include an API which can create charts out of financial stock market results and an API that provides blood glucose data for diabetes applications.