Sparx Enterprise Architect Is a highly extendable modelling tool - the full range of behavior can be extended with COM addin functionality and Visual Basic/JavaScript script customization.

For complex extensions, compiled code is needed, but this requires installation with admin authority.

EA.Gen.Addin bridges the flexibility of script add-ins, with the power of compiled extensions without the need to re-install software for every change. It does this by implementing the COM interface and forwarding calls to dynamically loaded components configured through as JSON script