JLink lets users author flow charts based on ISO 5807 and IBM standards. Developers can use JLink to add flowcharts to applications, serve a flow chart over the web in PDF or PNG, or dynamically create a flowchart with Javascript, Python or Ruby scripts
Coral is a tool and a development platform to create and transform models and modeling languages. It can be used to edit UML models, to develop editors for other modeling languages and to implement MDA and QVT-like model transformations.
Oh my God i`ts movin - is the Linux only tool for creating animated PNGS. omGim alows you to easilly create and edit existing apng`s with help of GIMP or Inkscape. You can import frames from PNG, SVG, etc.