Start using Sirius with Obeo Designer Community edition, a ready-to-use package including only Open Source technologies.
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Obeo Designer Team edition allows you to store your models and representations (diagrams, tables, trees) in a shared repository to facilitate collaboration with your other team members.
Note: Collaboration features are available for Sirius 3.1 with OD 8.1. Coming by the end of 2016, OD 9.1 will support these features for Sirius 4.1.