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Modelica has been around as a language from the late 1990's and since then a range of compilers and editors have emerged. Currently none of these environments provide a web-based user interface and follow the approach of requiring each end-user to install the application (typically together with a set of dependencies) on their local machine. This in itself may or may not be of major concern. Of more importance is their current lack of a seamless collaborative approach to modeling. This paper presents the first web-based collaborative graphical and textual modeling environment for Modelica based on WebGME and OpenModelica. Graphical composition of Modelica models from component libraries is supported via WebGME. Textual editing of the composite model is possible via OMWebBook.