Update: Latest version of Curuxa IDE published March, 23th. It fixes many bugs, works perfectly on Windows XP, Vista an Seven, and it's much easier to install and update. Download here
Curuxa is an open source electronics and robotics modular educative prototyping platform. It comprises a collection of Main Boards and Modules that can be connected to each other to build complex applications. Much more information.
Do you want to begin working on it? See Getting started.