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.
Online diagramming service Creately opened its Creately API to the public this month, and with some surprisingly innovative features. While providing obvious features to make its service available to outside developers, and several "above and beyond" features, such as easy embedding of diagrams, Creately has done something fairly unique: open up its own, web-based file format for other developers to use.
Nulab, a communication and collaboration applications company based in Japan, has announced the launch of the new Cacoo SDK edition which includes the brand new Cacoo SDK Edition API. Cacoo is a web-based collaborative drawing tool that allows users to create a variety of diagrams including sitemap, flowchart, mind map, wireframe, UML and network diagrams.
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.