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Downloads:
There have been no official releases of Apache Wave currently.
In the meantime, please use the code from source, or refer to our last release candidates (for pre-builds) by checking the wave-dev mailing list archives. The latest release candidate of Wave is 0.4-rc10 (posted on 10 October 2014). Docker builds are also being prepared for a consistent build process, though the project has not reached version 1.0 and thus can have breaking changes.
Communication:
Slack:
We are on the Apache Software Foundation slack #wave.
Community: