Hi, I've built a CMIS desktop client with Swing and OpenCMIS [1]. It is neither pretty nor complete but already useful to trace down bugs and run a quick query. In Open Text it is now used for testing.
It is not open source yet. But I'm willing to contribute it to Chemistry if the community thinks that this would make sense. - Florian [1] http://people.apache.org/~fmui/cmisclient/cmis-swing-client-0.1.zip
