NDEx provides an open-source framework where scientists and organizations can share, store, manipulate, and publish biological network knowledge. site 
The project maintains a free, public website; alternatively, users can also decide to run their own copies of the server software in cases where the stored networks must be kept in a highly secure environment or where high application load is incompatible with a shared public resource.
The NDEx Project is a joint effort of the Cytoscape Consortium and the Ideker Lab at the UC San Diego School of Medicine.
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I'm reminded of DAT which has similar goals for scientific interchange. While DAT emphasizes incremental update with branching, NDEx is much more about graph representation and integration.
It seems that every big system like this needs a public service, a web interface and an api for external application development. When wiki connects to these it is as just another applications. Wiki is similar to but slightly different from captive web applications in that it has its own sharing model.
One might ask, if 10% of wiki users were scientists sharing NDEx data, what part of that data would be shared through wiki and what part would be share through NDEx native sharing mechanisms.