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.
Important note: Obeo Designer Team is not available yet for Sirius 5. Obeo Designer 10.1 will support Sirius 5.1 at the end of 2017. In the meantime, you can evaluate Obeo Designer 9.1 supporting Sirius 4.1.