We are looking at jumping to the latest version of Confluence. I attached the report of the plug-in manager (no I didn't attach - can't attach PDFs here?, find it here: https://docs.google.com/open?id=0B_HuVg-yTgzndU14clQ2eXplM1k). There are some that I have not heard about previously that look like they could be components of a package.
Ones that are listing as incompatible that I know we are using are Scaffolding, Linking, Table.
The ones shown as Unknown that we use are Reporting, and Wiki Markup (why is that unknown?).
Are there some sub-components on this list? Are the RB* plug-ins important for any of the other plug-ins?
Confluence 4.2 was only recently released (2 weeks ago). It can take a little while for all our third party plugin developers to get all their information on plugins.atlassian.com up-to-date and accurate with the new release. So, even though the plugin may be listed as "incompatible" on plugins.atlassian.com and the plugin manager, it may actually work fine :-)
I don't know all of those plugins in your list, but I'll answer the ones that I can:
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