Quadrigram.com - looking to compete with Tableau, Quadrigram offers an online service (SaSS) to develop your own charts, graphs and visualizations from data sets.
Instead of code, Quadigram relies on a Visual Programming Language that provides users with a unique drag-and-drop environment for exploring ideas. Much of the work is performed simply by connecting points along a data flow. What begins as a data sample or live stream, passes through an a series of modules, and is eventually encoded as processed data or visualizations, that can be kept private or published directly to the web. Along this flow, a user can set up interactive controls to modify parameters dynamically and see the output change in real time at the other end, thus never having to recompile to get results. Even the visualization modules themselves can be used as controls, which feed the whole process backwards, to enable further exploration of a data set.