Tenniarb is a diagram/modelling tool, capable of doing simple and complex diagraming, easy organise them into categories.
Easy create and style them, and as benefit it has a powerfull JavaScript calculation engine embedded, so styling and diagraming become a real powerfull solution for any kind of fast modelling and prototyping.
Every item on diagram is an object with set of properties, some properties have influence on how item is displayed on diagram. Some properties are user defined data, properties could depend on calculations and other items and properties.
In general every item on diagram could be treated as a cell in electronic table, but it allow not just one formula to be used but to define any set of formal and properties to be used.