The CometVisu is only possible through the work of many:
The development discussions happen at the KNX User Forum (German spoken, but English is fine, too) as well as on Gitter. The code is hosted on GitHub.
To also start development only a fork of the repository is needed. Detailed information for developers are given in the CometVisu Wiki on GitHub.
The latest manual for the development version (nightly build) can is located at http://www.cometvisu.org/CometVisu/en/latest/manual/ and a nightly build of the code is also available.