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> can anyone name one open core product that is really successfull?

Mysql? Was doing really well even among the OSS crowd until Oracle, and post Oracle still seems to be doing alright.

Postgresql while not traditionally open core, there are a couple of companies that employ core contributors that sell addons fairly similar to the way Mysql used to(maybe still does I haven't looked at Mysql in a while.)

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Xen/XenSource seemed to go OK.

I'm not very sure about that. It certainly worked, but Xen lost a LOT of market to KVM, to the point they open sourced the whole thing (maybe a little too late?) in order to slow down the fall.

At least this is my impression. At the end of the day I do like Xen and Citrix, they were/are certainly good for virtualisation on linux.

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