Sustainable IDE (SIDE) is a set of graphical tools for developers who want to build sustainable software. Sustainable software is software you can extend easily, from a functional or technological point of view. On one hand, this means that when a user has a new requirement, it's easy for any developer to add it, even if the original author is not there anymore. On another hand, if you want to change the underlying technologies, you don't need to rewrite your existing application from scratch. Sustainable Software gives you the freedom to change technology, requirements, or achitecture. This can be achieved thanks to the use of models in a model driven software development (MDSD) paradigm.