The Gliffy PHP SDK by Gliffy allows API interaction, providing drawing features such as diagrams and flowcharts that developers can integrate into visualization applications. Resources include installation and configuration. To use the SDK, experiment creating a new diagram in PNG format.
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.
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.