The OSGeo Live development is coordinated via email and internet chat
(IRC) as detailed on the
OSGeo Wiki.
LISAsoft provide commercial support for the building of the Live DVD, as well as many of the applications packaged in it. Details at: http://www.lisasoft.com/LISAsoft/support.html.
Most packaged applications have both community and commercial support offerings for them. Refer to the package websites for details. In addition, there are a large number of consultancy firms world wide who provide support for OSGeo member projects. See http://www.osgeo.org/search_profile for one that meets your needs.